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Colorama


    This effect colorizes a selected element in an image, and cycles smoothly through the colors in the new color palette. Use keyframes to animate the colors; for example, make colors pulse as they follow a gradient path or zoom out of a radial gradient.

    Colorama converts the selected channel to grayscale (you can combine channels using the Add Phase option); then it remaps the grayscale values that you've chosen to a color palette (Output Cycle) that you've loaded (or created from scratch). It then "wraps" the grayscale file around the color wheel, mapping the successive colors to the increasingly lighter grays. When it gets to the white areas of the image, it completes the cycle by mapping those corresponding pixels to the color at the top of the Output Cycle's color wheel. You can then animate the cycle, so that in one revolution, each pixel of your layer travels through the complete color cycle you've chosen.

    For more information, see the After Effects product section on Adobe's Web site.