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Adobe After Effects Help
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ID Matte (PB only)
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 isolate objects based on their
Material ID as well. Select Use Coverage to create a cleaner matte by removing the color
stored behind object.
For more information, see the After Effects product section on Adobe's Web site.
Adjust effects
Use the Adjust effects to adjust color attributes such as brightness, balance, and levels 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 does not work on
individual channels). It adjusts all pixel values in the image at once—highlights, shadows,
and midtones.
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.
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