Adobe After Effects CS3 - Manual (Page 392)

AFTER EFFECTS CS3
User Guide
387
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.
Premultiply Matte Layer Premultiplies the new matte layer with the current layer.
Shift Channels effect
The Shift Channels effect replaces red, green, blue, and alpha channels in the image with other channels.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
Take Channel From The channel to use as a source.
Solid Composite effect
The Solid Composite effect offers a quick way to create a composite of a new color solid behind the original source
layer.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
Source Opacity The opacity of the source layer.
Color The color of the solid.
Opacity The opacity of the solid.
Blending Mode The blending mode used to combine the layer and the solid color.
Color Correction effects
The Rebel CC animation preset is a simple, telecine-style color-correction tool for coloring or grading a movie. This
animation preset uses expressions to control the Levels (Individual Controls) effect. To learn more and download
the animation preset, see Stu Maschwitz's blog:
www.adobe.com/go/learn_ae_sturebelcc .
John Dickinson provides visual aids on his website that illustrate how to use the Curves and Levels effects for color
adjustments:
www.adobe.com/go/learn_ae_jdcurves and www.adobe.com/go/learn_ae_jdlevels .
Using histograms to adjust color
A histogram is a representation of the number of pixels at each luminance value in an image. A histogram that has
nonzero values for each luminance value indicates an image that takes advantage of the full tonal range. A histogram
that doesn’t use the full tonal range corresponds to a dull image that lacks contrast.
A common color-correction task is adjusting an image to spread out the pixel values more evenly from left to right
on the histogram, instead of having them bunched up at one end or the other. Applying the Levels effect and
adjusting its Input White and Input Black properties in the histogram is an easy and effective way to accomplish this
task for many images.