To View A Color Channel Or Alpha Channel - Adobe AFTER EFFECTS 7.0 Manual

Dragging a guide from the ruler
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In the image area, drag a guide to reposition it.
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To lock or unlock guides, choose View > Lock Guides.
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In the image area, drag a guide line into a ruler to remove it.
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To show or hide all guide lines, choose View > Show Guides or Hide Guides.
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To remove all guide lines, choose View > Clear Guides.

To view a color channel or alpha channel

You can preview the red, green, blue, and alpha channels of a still image or movie in a Footage, Layer, or Composition
panel. When you view a color channel, areas with that color are displayed according to the color value of each pixel.
For example, if you view the red channel, areas with high red values are displayed as white.
To see the color values in a color channel displayed in the channel's own color instead of white, choose the Colorize
option from the Show Channel menu.
When you preview the alpha channel, After Effects displays transparent and opaque areas as black and white to make
identification easier. Degrees of opacity appear as shades of gray.
Open the Composition, Layer, or Footage panel to view a channel for a composition, layer, or footage item, respec-
1
tively.
2 At the bottom of the panel, click the Show Channel button
the menu.
To show the straight RGB values before being matted by the alpha channel, choose Show RGB Straight. In this
3
mode, areas with complete transparency are undefined and may contain random pixel colors.
Note: Alpha mode and RGB Straight mode do not show the checkerboard background.
All channels, color channels, and alpha channel
See also
"About alpha channels and mattes" on page 242
"About straight and premultiplied channels" on page 242
, then select RGB, Red, Green, Blue, or Alpha from
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User Guide