I can copy the red, green, and blue channels in an image and make them layers.
What I'm after is to have a document with 3 layers... one representing the red channel, one for green, another for blue. And when I choose the right blending mode for these layers, I end up simulating the original image... the colors will look correct.
Another possibility occurred to me, and that's to sort of simulate a bayer filter. like creating a photoshop pattern of 4 pixels. The red layer's pattern would have a white pixel at the top left, the other 3 dark. The blue layer's pattern would have the white pixel at the bottom right. The green layer pattern would have both the top right and bottom left pixels white, the other 2 dark.
How can I essentially combine pure red, green, and blue info in 3 layers to create full color?