Additive Color Mixing using Photoshop Dissolve Blend Mode

Click to see pixels at 100% - they are brighter - downsampling to fit the blog layout artificially darkened the image.

A simulation of additive RGB color mixing using the Photoshop dissolve blend mode.

Photoshop uses the same pixel patterns for a given opacity for each layer, so you have to build from the bottom up...

Set the base layer to 100% opacity.

Set the middle layer to 67% opacity. That will reveal 1/3 of the base.

Set the highest level to 33% opacity. That will reveal 2/3 of the mix of the first two.

Now you have each of the 3 layers revealed at 33% coverage.

I was unable to simulate subtractive CMY color mixing using the Photoshop dissolve blend mode.

UPDATE

It occurs to me that a highly magnified (nearest neighbor algorithm) blow-up of 16x16 pixel images of dissolve pixels in the right opacity proportions would be a great way to make the masks that randomly 'texture bomb' (shuffle) the 'Truchet tile'-style maze described here.

UPDATE

I see the same pixel patterns for a given opacity on multiple images (or the same resolution) - it doesn't randomize for each new file. So if you want to images of random pixels it may be best to (for example) cut them from different places in a larger image.