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View a color channel or alpha channelYou
can view red, green, blue, and alpha channels—together or separately—in
a Footage, Layer, or Composition panel by clicking the Show Channel
button  To see color values displayed in the channel’s
own color instead of white, choose Colorize from the Show Channel
menu. When you preview the alpha channel, the image appears as a grayscale image, with the transparency value of each pixel mapped to a scale from black (completely transparent) to white (completely opaque). Note: When you choose RGB Straight, which shows straight RGB values
before they are matted (premultiplied) with the alpha channel, pixels
with complete transparency are undefined and therefore may contain
unexpected colors.
You can view other channel values, such as saturation and hue, by applying the Channel Combiner effect and choosing Lightness from the To menu. To switch between showing the alpha channel and
showing all RGB channels, Alt-click (Windows) or Option-click (Mac
OS) the Show Channel button.
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at
the bottom of the panel and choosing from the menu. When you view
a single color channel, the image appears as a grayscale image,
with the color value of each pixel mapped to a scale from black
(0 value for the color) to white (maximum value for the color).