Copies selected channels from input image 2 to input image 1.

Composite.

Uses the original red channel.

Copies the red channel from input image 2.

Copies the green channel from input image 2.

Copies the blue channel from input image 2.

Copies the alpha channel from input image 2.

Copies the average luminance of the RGB channels from input image 2.

Copies black into the red channel.

Copies white into the red channel.

The controls for the Green, Blue and Alpha pop-up menus work the same as the Red channel listed above.