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Superimposing an Image’s Alpha Channel over Its RGB Channels

When you’ve read in an image that has an alpha channel, you can display the alpha channel as a red overlay on top of the image’s red, green, and blue channels.

To Display an Image’s Alpha Channel on its RGB Channels:

1.   Select Image > Read to read in an image.
2.   Connect a Viewer node to the Read node.

By default, Nuke displays the red, green, and blue channels in the Viewer.

3.   Click on the Viewer to make sure it’s the currently active panel.
4.   Press M.

Nuke displays the image’s alpha channel as a red overlay on top of the RGB channels.

5.   To return to the RGB display, press M again.