Adobe After Effects 5.0_ Effects, part 1

3D Channel effects read and manipulate the additional channels of information, includingz- depth, surface normals, object ID, texture coordinates, background color, unclamped RGB, and material ID. You can matte 3D elements along a z axis, insert other elements in a 3D scene, blur areas in a 3D scene, isolate 3D elements, apply a foggy effect with depth, and extract 3D channel information for use as parameters in other effects.

1 Adobe After Effects 5.0 Effects, part 1 This PDF ﬁle contains documentation for effects from the following effect categories: 3D Channel, Adjust, Audio, Blur & Sharpen, Channel, Distort, and Image Control. 3D Channel effects (PB only) The After Effects Production Bundle provides tools to integrate 3D scenes into 2D composites, and to make changes to those 3D scenes. You can import 3D channel image ﬁles saved in RLA, Softimage PIC/ZPIC, and Electric Image EI/EIZ formats. For PIC and EI ﬁles, the 3D channel information lives in the ZPIC or EIZ ﬁles, respectively. You don’t actually import ZPIC and EIZ ﬁles, but as long as they’re stored in the same folder with the PIC and EI ﬁles, you have access to their 3D channels using the effects in the 3D Channel Pack. The 3D channel effects have no effect on other types of ﬁles. 3D Channel effects read and manipulate the additional channels of information, including z-depth, surface normals, object ID, texture coordinates, background color, unclamped RGB, and material ID. You can matte 3D elements along a z axis, insert other elements in a 3D scene, blur areas in a 3D scene, isolate 3D elements, apply a foggy effect with depth, and extract 3D channel information for use as parameters in other effects. Note: Apply 3D Channel effects to 2D layers that have the auxiliary information. If you convert a layer to 3D and view it from anywhere else but the front and center, it will not display as expected. 3D Channel Extract This effect makes auxiliary channels visible as either grayscale or multichannel color images. You can then use the resulting layer as parameters for other effects. For example, extract the z-depth information in a 3D channel ﬁle and then use it as an inﬂuence map in the Particle Playground effect, or extract values from the Unclamped RGB channel to produce a matte that generates glowing highlights. Adjust the following controls for the 3D Channel Extract effect: 3D Channel Speciﬁes the channel that you want to extract from the 3D channel image ﬁle. You can extract Z Depth, Object ID, Texture UV, Surface Normals, Coverage, Background RGB, Unclamped RGB, and Material ID. White/Black Point Specify the value that is mapped to white or black. ADOBE AFTER EFFECTS 5.0 2 Effects, part 1 Depth Matte This effect reads the z-depth information in a 3D channel image ﬁle and can slice the image anywhere along that z axis. Use this effect to matte everything in front of or behind the value you specify. For example, remove a background in a 3D scene or insert objects into a 3D scene. Simply create two layers with the 3D channel ﬁle; then, in one layer, matte everything behind a certain point. In the other layer, matte everything in front of that same point, so that the two layers together make up the original image; then insert a layer between them with the object that you want to composite into the scene. Adjust the following controls for the Depth Matte effect: Depth Speciﬁes the depth of the z-axis where you want to slice the image. Feather Speciﬁes the amount of feather along the slice. Invert Inverts the feather. Depth of Field This effect simulates a camera that’s focusing in on one area in a 3D scene (along the z axis) while allowing other areas to blur. Adjust the following controls for the Depth of Field effect: Focal Plane Speciﬁes the speciﬁc distance, or plane, along the z axis that you want to focus on in the 3D scene. Identify this distance by clicking different parts of the 3D scene in the Composition window, while keeping an eye on the z-axis values that appear in the Info palette. Note that you must select the effect in the Effect Controls window before you click. Maximum Radius Describes how much blur is applied to objects outside of this plane. Focal Plane Thickness Determines the depth of the region that’s in focus. Focal Bias Sets the speed with which the out-of-focus elements lose focus. This value works like a gamma correction: the higher the value, the more quickly elements drop out of focus. Fog 3D This effect applies fog along the z axis, so the distant parts of a 3D scene look hazier or disappear behind the fog. Fog 3D simulates fog by behaving as though there is a scattering medium in the air that makes objects look more and more diffuse as they get more distant along the z axis. Adjust the following controls for the Fog 3D effect: Fog Color Speciﬁes the color of the fog. Fog Start Depth Determines where along the z axis the diffuse scattering begins. To specify this point, ﬁrst select different elements in the 3D scene and check their z depth in the Info palette. Fog End Depth Determines where the most diffuse area appears along the z axis. Fog Opacity Determines the opacity of the fog. Scattering Density Determines how quickly the scattering occurs. This value works like a gamma correction: the higher the value, the more dense the fog appears from its starting point. ADOBE AFTER EFFECTS 5.0 3 Effects, part 1 Foggy Background Selected by default. Deselect to create transparency at the back of the 3D scene for compositing on top of another image or scene. Gradient Layer Speciﬁes a grayscale layer to use as medium for increasing or decreasing the fog density. After Effects reads the luminance value in the grayscale image and applies it as the scattering medium. You could, for example, create a gradient layer from a swirling, drifting texture to create a more atmospheric fog effect. For best results, make sure that the dimensions of the gradient layer are the same as the footage, not the composition. Layer Contribution Speciﬁes how much the gradient layer affects the resulting fog. ID Matte This effect isolates elements in a 3D channel image. Many 3D programs tag each element in a scene with a unique Object ID. After Effects uses this information to create a matte that excludes everything in the scene except the element you want. Identify each object’s ID by applying the ID Matte effect and then clicking different parts of the image in the Composition window as you watch the Info palette. (You can also identify object IDs in the Layer window if you select the effect from the Layer window menu ﬁrst.) If you select Object ID for the Auxiliary Channel parameter in the Effect Controls window, the slider automati- cally reﬂects the ID for each object you select. In addition, you can isolate objects based on their Material ID as well. Adjust the following controls for the ID Matte effect: Auxiliary Channel Speciﬁes whether you’re isolating elements based on their Object IDs or their Material IDs. ID Selection Identiﬁes the unique ID value assigned to each element in a 3D scene. Feather Speciﬁes the amount of feather along the matte’s edges. Invert Inverts the feather. Use Coverage Creates a cleaner matte by decontaminating the pixels along the edge of the matte. It removes the colors stored behind the object from these pixels. This is applicable only if your 3D channel image ﬁle contains a coverage channel that stores information about the colors behind objects. Adjust effects Use the Adjust effects to adjust color in a layer. Brightness & Contrast This effect adjusts the brightness and contrast of the entire layer (not individual channels). The center point of each slider is neutral and indicates no effect. The layer’s quality setting does not affect Brightness & Contrast. Using the Brightness & Contrast effect is the easiest way to make simple adjustments to the tonal range of the image. It adjusts all pixel values in the image at once—highlights, shadows, and midtones. ADOBE AFTER EFFECTS 5.0 4 Effects, part 1 Channel Mixer This effect modiﬁes a color channel using a mix of the current color channels. Use it to make creative color adjustments not easily done with the other color adjustment tools: create high-quality grayscale images by choosing the percentage contribution from each color channel, create high-quality sepia-tone or other tinted images, and swap or duplicate channels. The Constant option speciﬁes the base amount of the input channel to be added to the output channel. Monochrome applies the same settings to all the output channels, creating a color image that contains only gray values. This is useful for images that you plan to convert to grayscale. If you select and then deselect Monochrome, you can modify the blend of each channel separately, creating a hand-tinted appearance. Color Balance This effect changes the amount of red, green, and blue color in a layer. The center point of each slider is neutral and indicates no effect. A setting of –100 removes all of the color; a setting of +100 intensiﬁes the color. The layer’s quality setting does not affect Color Balance. The Shadow/Midtone/Hilight (Channel) Balance option speciﬁes the amount of a channel’s color in the darker, middle, and lighter color intensity ranges of a layer. Preserve Luminosity preserves the average brightness of the image while changing the color. This option maintains the tonal balance in the image. Curves Use this effect to adjust the tonal range of an image. You can also use Levels to do this, but Curves gives you more control in the process when you need it. Instead of making the adjustments using just three variables (highlights, shadows, and midtones) as Levels does, Curves can adjust any point along the input scale while keeping up to 15 other values constant. When you apply the Curves effect, After Effects displays a graph in the Effect Controls window that you use to specify a curve. The horizontal axis of the graph represents the original brightness values of the pixels (input levels); the vertical axis represents the new brightness values (output levels). In the default diagonal line, all pixels have identical input and output values. Curves displays brightness values from 0 to 255 (8 bit) or 32768 (16 bit), with shadows (0) on the left. Use the Arbitrary Map option to draw a tonal curve by dragging. This feature helps you create a variety of interesting tonal and color effects. In addition, you can import curves and arbitrary maps from Photoshop. Curves supports .amp ﬁles (Windows) and Photoshop lookup ﬁles (Mac OS) created by using the pencil tool, and .acv ﬁles (Windows) and Photoshop spline ﬁles (Mac OS) created by using the graph tool. Adjust the curve in the graph, and adjust the following control for the Curves effect: Channel Speciﬁes the color channel or alpha channel to be modiﬁed. To use the Curves effect: 1 Choose Effect > Adjust > Curves. 2 If the image has more than one color channel, choose the channel you want to adjust from the Channel menu. RGB alters all channels using a single curve. ADOBE AFTER EFFECTS 5.0 5 Effects, part 1 3 Select Bezier ( ). 4 Click the part of the curve you want to adjust. 5 Click any points on the curve that you want to remain ﬁxed. For example, if you want to adjust the midtones while minimizing the effect on the highlights and shadows, click the quarter and three-quarter points on the curve. You can add up to 14 points to the curve, locking those values. 6 To remove a ﬁxed point, drag it off the graph. 7 Adjust the curve by dragging it. To use the Arbitrary Map option in the Curves effect: 1 Click the pencil tool to the right of the Curves graph. 2 Drag to draw the curve you want in the Curves graph. 3 If desired, click Smooth ( ) to smooth the curve. Hue/Saturation This effect adjusts the hue, saturation, and lightness of individual color components in an image. This effect is based on the color wheel. Adjusting the hue, or color, represents a move around the color wheel. Adjusting the saturation, or purity of the color, represents a move across its radius. Use the Colorize option to add color to a grayscale image converted to RGB, or to add color to an RGB image. Adjust the following controls for the Hue/Saturation effect: Channel Control Speciﬁes the color channel you want to adjust. Choose Master to adjust all colors at once. Channel Range Speciﬁes the deﬁnition of the color channel selected in the Channel Control menu. Two color bars represent the colors in their order on the color wheel. The upper color bar shows the color before the adjustment; the lower bar shows how the adjustment affects all of the hues at full saturation. Use the adjustment slider to edit any range of hues. Master Hue Speciﬁes the overall hue of the channel selected in the Channel Control menu. Use the dial, which represents the color wheel, to change the overall hue. The underlined value displayed above the dial reﬂects the number of degrees of rotation around the wheel from the pixel’s original color. A positive value indicates clockwise rotation; a negative value indicates counterclockwise rotation. Values range from –180 to +180. Master Saturation and Master Lightness Specify the overall saturation and lightness of the channel selected in the Channel Control menu. Values range from –100 to +100. Colorize Adds color to a grayscale image converted to RGB, or adds color to an RGB image—for example, to make it look like a duotone image by reducing its color values to one hue. Colorize Hue, Saturation, and Lightness Specify the hue, saturation, and lightness of the color range you selected in the Channel menu. After Effects displays only the sliders for the Channel menu selection. To adjust an image using Hue/Saturation: 1 Choose Effect > Adjust > Hue/Saturation. 2 From the Channel menu, choose which colors to adjust: ADOBE AFTER EFFECTS 5.0 6 Effects, part 1 • Choose Master to adjust all colors at once. • Choose a preset color range for the color you want to adjust, and then use the sliders for that color range. 3 For Hue, type a value or drag the slider. 4 For Saturation, type a value or drag the slider. The color shifts away from or toward the center of the color wheel, relative to the beginning color values of the selected pixels. Values range from –100 to +100. 5 For Lightness, type a value or drag the slider. Values range from –100 to +100. To modify the range of an adjustment slider: 1 From the Edit menu, choose an individual color. By default, the range of color selected when you choose a color component is 30° wide, with 30° of fall-off on either side. Setting the fall-off too low can produce dithering in the image. 2 Do any of the following: • Drag one or both of the white triangles to adjust the amount of feather without affecting the range. • Drag one or both of the vertical white bars to adjust the range. Increasing the range decreases the fall-off, and vice versa. A B A. Adjusts feather without affecting range B. Adjusts range of color To colorize an image or create a monotone effect: 1 Choose Effect > Adjust > Hue/Saturation. 2 Select Colorize. The image is converted to the hue of the current foreground color. The lightness value of each pixel does not change. 3 Drag the Colorize Hue slider to select a new color if desired. 4 Drag the Colorize Saturation and Colorize Lightness sliders. Levels This effect remaps the range of input color levels onto a new range of output color levels, and changes the gamma correction curve at the same time. The Levels effect is useful for basic image quality adjustment. This effect functions the same as the Levels adjustment in Photoshop and displays in the same way if monitor calibration is off. The gamma of any curve is its slope, expressed as the ratio of the logs of the output to input values. For example, a gamma value of 1.0 equals an output-to-input ratio of 1:1. Moving the midpoint of the curve up (in an RGB readout) lowers the gamma value; moving the midpoint down raises the gamma value. Gamma speciﬁes contrast that affects the midtones in a range. ADOBE AFTER EFFECTS 5.0 7 Effects, part 1 You can adjust the brightness, contrast, and gamma in an image. Use Levels to adjust the gamma to change the brightness values of the middle range of gray tones without dramatically altering the shadows and highlights. Adjust the following controls for the Levels effect: Channel Speciﬁes the color channel to be modiﬁed. Histogram Shows how the pixel values are distributed in an image. The horizontal axis of the histogram represents the brightness value. The vertical axis represents the number of pixels at each brightness level. No pixels can be darker than the output black level, and no pixel can be brighter than the output white level. Input Black Speciﬁes the threshold of the black value for the input image. Pixels below the input black level are mapped as black on the input image. The input black value is represented by the upper left triangle below the histogram. Output Black Speciﬁes the limit of the black value for the output image. The output black value is repre- sented by the lower left triangle below the histogram. Gamma Speciﬁes the gamma value, which is represented by the middle triangle below the histogram. Output White Speciﬁes the limit of the white value for the output image. The output white value is repre- sented by the lower right triangle below the histogram. Input White Speciﬁes the threshold of the white value for the input image. Pixels below the input white level are mapped as white on the input image. The input white value is represented by the upper right triangle below the histogram. Posterize Use this effect to specify the number of tonal levels (or brightness values) for each channel in an image. Posterize then maps pixels to the closest matching level. For example, choosing two tonal levels in an RGB image gives you two tones for red, two tones for green, and two tones for blue. Values range from 2 to 255. Although the results of this effect are most evident when you reduce the number of gray levels in a grayscale image, Posterize also produces interesting effects in color images. Use Level to adjust the number of tonal levels for each channel to which Posterize will map existing colors. A B C A. Original image B. Posterize applied with ﬁve levels of color C. Threshold applied ADOBE AFTER EFFECTS 5.0 8 Effects, part 1 Threshold Use this effect to convert grayscale or color images to high-contrast, black-and-white images. Specify a certain level as a threshold; all pixels lighter than the threshold are converted to white and all pixels darker to black. Audio effects This category contains audio effects that add ambience to a layer, enhance or correct audio characteristics, and create effects. You can apply audio effects to existing audio footage, or synthesize just about any sound by combining the Tone effect with other audio effects. Backwards This effect reverses an audio footage item by playing it from the last frame or keyframe to the ﬁrst frame or keyframe. The frames remain in their original order when viewed in the Timeline window. Bass & Treble Make basic adjustments to the audio tone of an audio layer using this effect by specifying the amount of boost or cut applied to the low frequencies (bass) or the high frequencies (treble) of the audio layer. If you need greater control in working with audio tone, use the Parametric Equalization effect in the After Effects Production Bundle. The Bass/Treble option speciﬁes the amount of boost or cut applied to the low frequencies of the audio layer. Delay This effect repeats the sounds in the audio layer after a speciﬁed amount of time. This simulates sound bouncing off a surface, such as a wall some distance away. To simulate the acoustic ambience of a room, use the Reverb effect in the After Effects Production Bundle. Adjust the following controls for the Delay effect: Delay Time Speciﬁes the interval of time between the original sound and its echo, in milliseconds. Drag the slider to the right to increase the time between the original sound and its echo. Delay Amount Speciﬁes the level of the ﬁrst delayed audio. Drag the slider to the right to increase the amount of the original sound that is sent as echo. Feedback Speciﬁes the amount of the echo that is fed back into the delay line to create subsequent echoes. Drag the slider to the right to increase the amount of echo signal fed back into the delay line. Dry Out, Wet Out Specify the balance of the original (dry) sound to the delayed (wet) sound in the ﬁnal output. Values of 50% are commonly used. Flange & Chorus (PB only) This effect combines two separate audio effects, Flange and Chorus, into a single effect. Chorus is commonly used to add depth and character to audio footage that contains a single instrument or voice. Chorus makes one voice sound like many voices. ADOBE AFTER EFFECTS 5.0 9 Effects, part 1 Flange applies a copy of the sound that is detuned, or played at a frequency slightly offset from the original. By experimenting with the voice separation time and the modulation depth, you can create a wavy, rushing sound. The default settings apply to the Flange effect alone. Adjust the following controls for the Flange & Chorus effect: Voice Separation Time (ms) Speciﬁes the time in milliseconds that separates each voice. Each voice is a delayed version of the original sound. Low values are commonly used for ﬂange, and higher values for chorus. Voices Speciﬁes the number of voices in the processed (wet) audio. Increasing this value applies more of a chorus effect. Modulation Rate Speciﬁes the rate in Hz at which the frequency modulates. Modulation Depth Speciﬁes the amount of frequency modulation. Voice Phase Change Speciﬁes the modulation phase difference in degrees between each subsequent voice. Invert Phase Inverts the phase of the processed (wet) audio. Inverting the phase accents more of the high frequencies, whereas not inverting the phase accents more of the low frequencies. Stereo Voices Alternates each voice between two channels so that the ﬁrst voice appears in the left channel, the second in the right channel, the third in the left, and so on. To hear stereo voices, you must preview the audio in stereo or render the movie in stereo. Dry Out/Wet Out Specify the mix of unprocessed (dry) audio to processed (wet) audio in the ﬁnal output. Values of 50% are commonly used. To apply the Chorus effect without Flange: Adjust the following controls: • For Voice Separation Time (ms), select a value of about 40. For a deeper chorus effect, increase this value. • For Voices, select 4. • For Modulation Rate, select a value of about 0.1. • For Modulation Depth, select 50%. • For Voice Phase Change, select 90, and then select the Stereo Voices option. To quickly ﬁnd an optimal phase change based on the number of voices you have chosen, use the formula P=360/x, where P is the phase change and x is the number of voices. • For Dry Out/Wet Out, select 50% each. To make voices appear from more than one direction and get louder over time, select Stereo Voices, drag the Dry Out slider to 0.0 so you hear just the effect, and then set keyframes so that the voices fade in over time. High-Low Pass (PB only) This effect sets a limit above or below which frequencies can pass. High Pass allows frequencies above the limit and blocks frequencies below. Conversely, Low Pass allows frequencies below the limit and blocks frequencies above. Use High-Low Pass to do the following: ADOBE AFTER EFFECTS 5.0 10 Effects, part 1 • Enhance or attenuate (reduce) a sound. For example, a High Pass effect can reduce trafﬁc noise, which often is concentrated at low frequencies, while minimally affecting a voice recording. A Low Pass effect can remove high-frequency sounds, such as static and buzzing. • Change the focus from one sound to another over time. For example, in audio that contains both music and voice, you can fade out the music while gradually bringing in the voice. • Protect equipment from potentially damaging frequencies. • Direct certain frequencies to speciﬁc equipment. For example, a Low Pass effect can isolate sounds intended for a subwoofer. Adjust the following controls for the High-Low Pass effect: Filter Options Speciﬁes whether to apply High Pass or Low Pass. Cutoff Frequency For High Pass, speciﬁes the frequency below which the footage is not audible. For Low Pass, speciﬁes the frequency above which the footage is not audible. Dry Out/Wet Out Specify the mix of unprocessed (dry) audio to processed (wet) audio in the ﬁnal output. Common values for removing frequencies are 0% for Dry Out and 100% for Wet Out. To remove frequencies using the High-Low Pass effect: 1 Determine if the unwanted sound has predominantly high- or low-frequency content. 2 For Filter Options, choose High Pass if the unwanted sound has low-frequency content; otherwise, choose Low Pass. 3 Adjust the cutoff frequency to isolate the unwanted sound from the frequencies you want to keep. To help isolate the unwanted sound, apply the Audio Spectrum effect to a motion footage layer to see the magnitude of the frequencies in the range you deﬁne. 4 Choose 0% for Dry Out and 100% for Wet Out. 5 To verify that the frequencies you are cutting off are the ones you want to remove, switch to the opposite ﬁlter and then preview the audio. 6 To identify which cutoff frequencies work best, do one of the following: • Continue to adjust the cutoff frequency and preview the audio until you reduce or remove the unwanted sound while minimally affecting the frequencies you want to keep. • Set keyframes for different cutoff frequencies, and then preview the audio. 7 Before closing the Effect Controls window, make sure that you have selected the same effect you applied in step 3. Modulator (PB only) This effect adds both vibrato and tremolo to audio by modulating (varying) the frequency and amplitude. Using Modulator, you can create a Doppler effect, such as when a train whistle gets higher in pitch as it approaches an observer, and then drops in pitch as it passes. Adjust the following controls for the Modulator effect: Modulation Type Speciﬁes the type of waveform to use. ADOBE AFTER EFFECTS 5.0 11 Effects, part 1 Sine waves Produce the purest sounds. Triangle waves Produce more distorted sounds. Modulation Rate Speciﬁes the rate in Hz at which the frequency modulates. Modulation Depth Speciﬁes the amount of frequency modulation. Amplitude Modulation Speciﬁes the amount of amplitude modulation. Parametric EQ (PB only) This effect either emphasizes or attenuates speciﬁc frequency ranges. Parametric EQ is useful for enhancing music, such as boosting low frequencies to bring up bass. Using this effect, you can enhance up to three different bands of the audio footage. As you specify controls, a Frequency Response graph indicates the combined equalization curve you create. On the Frequency Response graph, Band 1 is red, Band 2 is green, and Band 3 is blue. You may ﬁnd it easier to specify controls if you determine in advance the frequency- response curve you want. Adjust the following controls for the Parametric EQ effect: Band Enabled Activates an equalization band and its controls. Frequency Speciﬁes which frequency to modify. This frequency acts as the peak of the effect—the center of the bandwidth you specify. Bandwidth Sets the range of frequencies to enhance above and below the frequency you chose to modify. Boost/Cut Speciﬁes the amount of boost or cut applied to the amplitude of the frequencies inside the speciﬁed bandwidth. Positive values boost; negative values cut. If you have audio with an unwanted sound (such as a beep from a forklift in the background), you can isolate and cut the frequency range of the beep to attenuate the sound. You may need to experiment with several settings to isolate the frequency range. To do this, set keyframes for different Parametric EQ properties, and then preview the audio. You can also apply the Audio Spectrum effect to a motion footage layer to see the magnitude of the frequencies in the range you deﬁne. Reverb (PB only) This effect simulates a spacious or acoustically live interior by simulating random reﬂections of a sound off of a surface. Adjust the following controls for the Reverb effect: Reverb Time (ms) Speciﬁes the average time in milliseconds between the original audio and the rever- berated audio. Diffusion Speciﬁes how much the effect scatters the original audio. More diffusion can make the audio sound further from the microphone. Decay Speciﬁes the amount of time it takes for the effect to subside. A longer decay simulates a larger space. Brightness Speciﬁes the amount of detail preserved from the original audio. More brightness can simulate a room with live, or highly reﬂective, acoustics. ADOBE AFTER EFFECTS 5.0 12 Effects, part 1 Dry Out/Wet Out Specify the mix of the unprocessed (dry) audio to the processed (wet) audio in the ﬁnal output. Stereo Mixer Use this effect to mix the left and right channels of an audio layer and pan the entire signal from one channel to the other. Left Level, Right Level Speciﬁes the level of the left or right audio channel of an audio layer. A value of 2.00 is full level. Left Pan, Right Pan Shifts the mixed stereo signal from one audio channel to the other. Values of –1.00 for Left pan and +1.00 for Right pan produce an even balance. Invert Phase Inverts the phase of both channels of the stereo signal. Use this to prevent two sounds at the same frequency from canceling each other out. Tone (PB only) This effect synthesizes simple tones to create effects such as the low rumble of a submarine, a telephone ringing in the background, sirens, or a laser blast. You can add up to ﬁve tones for each effect to create a chord, for example, in a composition. When you apply this effect to audio footage, the dry (unprocessed) audio is ignored, and only the tone plays. You can also apply the Tone effect to a layer that has no audio, such as an Adobe Illustrator object, to synthesize audio. When you render the movie, make sure that you select an output format that supports audio, for example, QuickTime or Video for Windows. Adjust the following controls for the Tone effect: Waveform Options Speciﬁes the type of waveform to use. Sine waves Produce the purest tones. Square waves Produce the most distorted tones. Triangle waves Have elements of both, but are closer to Sine. Saw waves Have elements of both, but are closer to Square. Frequency 1...5 Speciﬁes the frequency in Hz of the ﬁrst through the ﬁfth tones. To turn off a tone, set its frequency to 0.0. Level Changes the amplitude of all tones. If you hear clicking when you preview or play the audio, you may have set the Level value too high. To produce a clean sound, use a percentage less than or equal to 100 divided by the number of frequencies you use. For example, if you use all ﬁve frequencies, choose 20%. To avoid clicks at the end of a tone, set a keyframe for the desired amplitude level at the frame just before the end of the tone, and then set another keyframe for a level of 0.0 at the end of the tone. This technique works well for any music you end abruptly. ADOBE AFTER EFFECTS 5.0 13 Effects, part 1 Blur and Sharpen effects in Adobe After Effects Use these effects to soften or sharpen an image. Channel Blur This effect blurs a layer’s red, green, blue, or alpha channels individually. You can specify that the blur is horizontal, vertical, or both. At Best quality, the blur is smooth. Use this effect for glow effects or if you want a blur that does not become transparent near the edges of the layer. The Edge Behavior option describes how to treat the edges of a blurred image. If you deselect it, pixels outside of the image are transparent, which makes the edges of the blurred image semitransparent. Select the Repeat Edge Pixels option to repeat the pixels around the edges, preventing the edges from darkening and becoming more transparent. Compound Blur This effect blurs pixels in the selected layer based on the luminance values of a blur layer, also known as a blurring map. The blur layer, which can be any layer that contains pixels of different luminance values, is essentially overlaid on top of the selected layer and the pixels of both layers are matched, one to one. Where the blur layer is black, no blurring occurs in the same location in the selected layer. The blur layer is used only as a map; it is not visible in the composition. The Blur Layer speciﬁes the layer in the composition to use as the blurring map. Bright values in the blur layer correspond to more blurring of the affected layer, while dark values correspond to less blurring. Maximum Blur speciﬁes the maximum amount, in pixels, that any part of the affected layer can be blurred. The Stretch Map to Fit option stretches the blur layer to the dimensions of the layer to which it is applied; otherwise, it is centered. Invert Blur inverts the values, so areas that were previously more blurred will be less blurred, and vice versa. This effect is useful for simulating smudges and ﬁngerprints, or changes in visibility due to atmospheric conditions such as smoke or heat, especially with animated blurring layers. Compound Blur is especially effective in combination with other effects, such as Displacement Map. Directional Blur This effect gives a layer the illusion of motion. In previous versions of After Effects, this effects was called Motion Blur. At Draft quality, the effect is a blur of the image in which each pixel is the unweighted average of its adjacent pixels. At Best quality, the effect uses Gaussian weighting, producing a smoother, more graduated blur. The Direction option speciﬁes the direction of the blur. The blur is applied equally around a pixel’s center; therefore, a setting of 180 degrees and a setting of 0 degrees look the same. A B C A. Original B. Directional Blur C. Radial Blur ADOBE AFTER EFFECTS 5.0 14 Effects, part 1 Fast Blur Use this effect to blur an image. Specify whether the blur is horizontal, vertical, or both. At Best quality, the Fast Blur effect is a close approximation of a Gaussian Blur, but it blurs large areas more quickly. Select Repeat Edge Pixels to blur the contents of the layer while keeping the edges of the layer sharp. Gaussian Blur This effect blurs and softens the image and can reduce noise. Specify whether the blur is horizontal, vertical, or both. The layer’s quality setting does not affect Gaussian Blur. Radial Blur This effect creates blurs around a speciﬁc point in a layer, simulating the effects of a zooming or rotating camera. At Draft quality, the blur appears somewhat grainy. You may prefer the draft results for special effects, but the grain may ﬂicker on interlaced displays. The Amount option speciﬁes the amount of blur, depending on the selection for Type. For a Spin blur, which applies blurs in circles around the center point, the Amount value indicates the degree of rotation. For a Zoom blur, which applies blur that radiates out from the center point, the Amount value speciﬁes the degree of radial blurring. You can specify the level of anti-aliasing applied at Best quality; no anti-aliasing is applied at Draft quality. Sharpen This effect increases the contrast where color changes occur. The layer’s quality setting does not affect Sharpen. A B C A. Original image B. Sharpen C. Unsharp Mask Unsharp Mask This effect increases the contrast between colors that deﬁne an edge. Use the Radius option to specify the depth of pixels that will be affected at an edge. If you specify a high value, more of the pixels surrounding the edge are adjusted for contrast. If you specify a low value, only pixels at the edge are adjusted. Use the Threshold option to specify a tolerance to deﬁne edges and prevent overall contrast adjustment that might generate noise or cause unexpected results. Values deﬁne the range of contrast allowed between adjacent pixels before contrast is adjusted. A lower value produces a more pronounced effect. ADOBE AFTER EFFECTS 5.0 15 Effects, part 1 Channel effects Use these effects to manipulate, extract, insert, and convert the channels of an image. The channels themselves include the component color values (red, green, and blue); calculated color values (hue, saturation, and luminance); and transparency values (alpha channel). Alpha Levels (PB only) This effect increases or decreases the transparency of a matte. Use Alpha Levels to adjust pure black or pure white areas of a matte to be semitransparent, or to adjust grays (semitransparent areas) to be pure black and white. Alpha values are converted using Input limits, Output limits, and the Gamma value. Adjust the following controls for the Alpha Levels effect: Input and Output limits Specify where transparency begins and ends. Gamma Affects the range of gray values that are converted. A Gamma value of 1 produces a gradual (linear) distribution of gray values. A Gamma value of less than 1 creates darker gray values and more transparency. A gamma value of greater than 1 creates lighter gray values and less transparency. To convert grays in the matte to pure black or white: 1 Set the Input Black Level to a gray value. Alpha values at this level or lower become fully transparent (black). 2 Set the Input White Level to a gray value. Alpha values at this level or higher become fully opaque (white). 3 Leave the Output Black Level set to 0 and the Output White Level set to 255. 4 If necessary, adjust the Gamma value to increase or decrease transparency. To convert pure black and white in the matte into gray areas: 1 Leave the Input Black Level at 0 and the Input White Level at 255. 2 Set the Output Black Level slider to a gray value. Alpha values below this value are raised to this value. 3 Set the Output White Level to a gray value. Alpha values above this value are lowered to this value. Arithmetic This effect performs various simple mathematical operations on an image’s red, green, and blue channels. The Operator option speciﬁes the mathematical operation to perform between the value you specify for each channel and the existing value of that channel for each pixel in the image: And, Or, and Xor apply bitwise logical combinations of the speciﬁed value; Add, Subtract, and Difference apply basic math functions using the speciﬁed value; Max selects each pixel in the color channel that is less than the speciﬁed value and sets it at the speciﬁed value; Min selects each pixel in the channel that is greater than the speciﬁed value and sets it at the speciﬁed value. Block Above and Block Below turn the channel off everywhere that it is respectively greater or less than the speciﬁed value; Slice turns the channel off where it is below the value speciﬁed and turns it on where it is above the speciﬁed value. The Clip Result Values option prevents all functions from creating color values that exceed the valid range. If this option is not selected, some color values may wrap around from on to off, or vice versa. ADOBE AFTER EFFECTS 5.0 16 Effects, part 1 Blend This effect blends two layers together using one of ﬁve modes. A crossfade is a standard transition between two images: the original image fades out while the new image fades in. Two images blended together to create a textured butterﬂy Note: You can create blends more easily and quickly using layer modes, but you can’t animate layer modes. The advantage of using the Blend effect is that you can animate it. Adjust the following controls for the Blend effect: Blend with Layer Speciﬁes the layer to be blended with the original layer. Mode Speciﬁes the Blend mode you want to use. Choose from the following options: Crossfade fades between the original image and the secondary image. Color Only Colorizes each pixel in the original image based on the color of each corresponding pixel in the secondary layer. Tint Only Is similar to Color Only, but tints pixels in the original image only if they are already colored. Darken Only Darkens each pixel in the original image that is lighter than the corresponding pixel in the secondary image. Lighten Only Lightens each pixel in the original image that is darker than the corresponding pixel in the secondary image. Blend with Original Speciﬁes the fading level between the blended image and the original image. A setting of 0% shows only the secondary layer (or just the layers speciﬁed with Blend if you are in Crossfade mode). At 100%, only the ﬁrst layer is visible. Changing this slider linearly over time gives you a standard crossfade. To try the other blending modes, set Blend with Original to 0% to see the full effect of each mode. Note: You can create a crossfade without applying an effect by animating the Opacity property of one layer on top of another. However, this will not work if the frontmost layer has any transparent portions (which would allow the other layer to show through, even when at full opacity). The Crossfade mode creates a proper crossfade between two layers, even if both have transparent regions. If Layer Sizes Differ Speciﬁes how to position the layers. The layer’s quality setting affects Blend only if Stretch to Fit is selected and if the layers are of different sizes. Stretching at Best quality will be much smoother. To use the Blend effect: 1 Make sure that the two source items to blend have been added to your composition. ADOBE AFTER EFFECTS 5.0 17 Effects, part 1 2 Apply the Blend to one layer (A) and choose the name of the other layer (B) in the Blend with Layer pop- up menu. 3 Hide layer B by clicking the Video switch next to the layer in the Audio/Video Features panel in the Timeline window. Cineon Converter This effect provides a high degree of control over color conversions of Cineon frames. In After Effects 5.0, you can convert the color in a Cineon ﬁle using controls in the Interpret Footage dialog box or using the Cineon Converter effect. To use the Cineon Converter, import a Cineon ﬁle and leave it in its default state; After Effects will either condense the colors to 8 bit or expand them to 16 bit, depending on the mode you are working in. You can then apply the Cineon Converter to the ﬁle and precisely adjust the colors while interactively viewing the results in the Composition window. Set keyframes to adjust for changes in tone over time—use keyframe interpolation and ease handles to precisely match the most irregular lighting changes, or leave the ﬁle in its default state and use the converter. The 10 bits of data available in each Cineon channel make it easier to enhance an important range of tones while preserving overall tonal balance. By carefully specifying the range, you can create a version of the image that faithfully resembles the original. Adjust the following controls with the Cineon Converter: Conversion Type Speciﬁes how the Cineon ﬁle is converted. Choose one of the following (obsolete options of each are available for compatibility with projects converted from older versions of After Effects): Log to Linear Converts an 8-bit logarithmic non-Cineon layer that you plan to render as a Cineon sequence. Linear to Log Converts a layer containing an 8-bit linear proxy of a Cineon ﬁle into an 8-bit logarithmic ﬁle so that its display characteristics are consistent with the original Cineon ﬁle. Log to Log Detects an 8- or 10-bit logarithmic Cineon ﬁle when you plan to render it as an 8-bit logarithmic proxy. 10 Bit Black Point Speciﬁes the black point (minimum density) for converting a 10-bit logarithmic Cineon layer. Internal Black Point Speciﬁes the black point used for the layer in After Effects. 10 Bit White Point Speciﬁes the white point (maximum density) for converting a 10-bit logarithmic Cineon layer. Internal White Point Speciﬁes the white point used for the layer in After Effects. Gamma Speciﬁes the value of midtones. Highlight Rolloff Speciﬁes the rolloff value used to correct bright highlights. To control the tonal balance of a Cineon ﬁle: 1 Import the Cineon ﬁle into After Effects and add it to a composition. 2 Select the Cineon ﬁle layer in the Composition or Timeline window and choose Effect > Cineon Tools > Cineon Converter. ADOBE AFTER EFFECTS 5.0 18 Effects, part 1 3 Choose an option from the Conversion Type menu. 4 Adjust the black point: • To darken areas or make areas black, drag the 10 Bit Black Point slider to the right. • To lighten black areas and make details in dark areas visible, drag the 10 Bit Black Point slider to the left. 5 Adjust the white point: • To whiten gray areas, drag the 10 Bit White Point slider to the left. • To darken white areas or make the lightest details visible, drag the 10 Bit White Point slider to the right. If adjusting the brightest areas makes the rest of the image appear too dark, use the Highlight Rolloff slider to adjust these bright highlights. 6 Adjust midtones by dragging the Gamma slider to the left to darken midtones, or to the right to lighten midtones. 7 If highlights appear as white blotches, drag the Highlight Rolloff slider to the right until details are visible. An image with high contrast may require a high rolloff value. Note: Each computer monitor has unique display characteristics that affect your perception of color on-screen. For best results when evaluating tonal balance, use the Info palette in After Effects to see the true color values of pixels as you move the pointer over them. Compound Arithmetic This effect mathematically combines the layer to which it is applied with another layer. The Compound Arithmetic effect is intended only to provide compatibility with projects created in earlier versions of After Effects that use the Compound Arithmetic effect. Using layer modes is more effective than using the Compound Arithmetic effect in most situations. Adjust the following controls for the Compound Arithmetic effect: Second Source Layer Speciﬁes the layer to use with the current layer in the given operation. Operator Speciﬁes the operation to perform between the two layers. Operate on Channels Speciﬁes the channels to which the effect is applied. Overﬂow Behavior Speciﬁes how pixel values that exceed the allowed range are treated. Choose from the following options: Clip Indicates that the values will be limited to the allowed range. Wrap Indicates that values exceeding the allowed range will wrap around from full on to full off, and vice versa. Scale Indicates that the maximum and minimum values will be calculated and the results will be stretched down from that full range to the range of allowable values. Stretch Second Source to Fit Scales the second layer to match the size (width and height) of the current layer. If this option is deselected, the second layer is placed at its source’s current size, aligned with the upper left corner of the source layer. Blend with Original Adjusts the opacity of the second source layer so it blends with the original layer. ADOBE AFTER EFFECTS 5.0 19 Effects, part 1 Invert This effect inverts the color information of an image. Adjust the following controls for the Invert effect: Channel Speciﬁes which channel or channels to invert. Each group of items operates in a particular color space, inverting either the entire image in that color space or just a single channel. RGB Consists of three additive color channels: red, green, and blue. HLS Consists of three calculated color channels: hue, lightness, and saturation. YIQ Is the NTSC luminance and chrominance color space, where Y is the luminance signal, and I and Q are the inphase and quadrature chrominance signals. Alpha (not a color space) Provides a way to invert the alpha channel of the image. Blend with Original Combines the inverted image with the original. You can apply a fade to the inverted image. Minimax This effect enlarges or reduces a matte for a speciﬁc channel or all channels. It assigns each pixel the minimum or maximum pixel value found within a speciﬁed radius. For example, a white solid layer with a square mask shrinks one pixel on each side using Minimum and a radius of 1. The layer’s quality setting does not affect Minimax. Adjust the following controls for the Minimax effect: Operation Speciﬁes how the effect processes the matte: Minimum Replaces a pixel with the smallest pixel value within the radius speciﬁed. Maximum Replaces a pixel with the largest pixel value within the radius speciﬁed. Minimum Then Maximum Performs the Minimum operation on the layer followed by the Maximum operation using the Radius setting. Maximum Then Minimum Does the opposite of Minimum Then Maximum. Radius Speciﬁes how many pixels to examine for the Minimum or Maximum operation. Channel Speciﬁes the channel. Color Affects the color channels only. Alpha and Color Affects all channels. Red, Green, Blue, and Alpha Affect only the respective channels. Direction Speciﬁes the direction of scanning for values. Horizontal & Vertical Scans all directions for the minimum or maximum pixel. Just Horizontal and Just Vertical Scan only left and right or up and down, respectively. ADOBE AFTER EFFECTS 5.0 20 Effects, part 1 Remove Color Matting This effect removes color fringes from layers that are premultiplied with a color. It is useful when merging alpha and ﬁll from separate ﬁles. If you import footage with a premultiplied alpha channel, or if you create alpha channels with After Effects, you may need to remove halos from an image. Halos are caused by a large contrast between the image’s color and the background, or matte, color. Removing or changing the color of the matte can remove the halos. (Halos can also be caused by a misinterpretation of an alpha channel’s premultiplied color.) Use Background Color to specify the new background color when you want to change the color of a matte. Set Channels This effect copies channels from other layers to the red, green, blue, and alpha channels of the current layer. For example, you can take the luminance of one layer and put it into the color channel of the selected layer. All source layers are centered in the current layer. With Best quality selected, any stretched layers are anti-aliased. Use Stretch Layers to Fit to resize all other layers to the size of the layer to which Set Channels is being applied. Set Matte This effect replaces the alpha channel (matte) of a layer with a channel from another layer above it for the creation of traveling matte effects.The Set Matte effect is intended only to provide compatibility with projects created in earlier versions of After Effects that use the Set Matte effect. To create a traveling matte using the Set Matte effect, set up the motion of the matte layer and precompose that layer with all properties. Use the resulting composition as the layer from which to take the matte. Although you can use Set Matte for a traveling matte, it is easier and faster to create traveling mattes by using a track matte. Adjust the following controls for the Set Matte effect: Take Matte from Layer Speciﬁes the layer to use as the replacement matte. You can specify any layer in the composition. Use for Matte Speciﬁes the channel of the speciﬁed layer to use for the matte. Invert Matte Inverts the transparency values of the matte. Stretch Matte to Fit Scales the selected layer to match the size of the current layer. If unselected, the layer designated as the matte is centered in the ﬁrst layer. Composite Matte with Original Composites the new matte with the current layer, rather than replacing it. The resulting matte allows the image to show through only where the current matte and the new matte both have some opacity.

Tải về miễn phí