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An experiment in combining CMY subtractive color channels into a full color image using Photoshop's Normal blend mode.
The bottom layer must be set to 100% (one over one)
The middle layer must be set to 50% (one over two)
The top layer must be set to 33% (one over three)
This effectively averages the images into a 1/3 intensity composite. A final 300% dimming curve (pinned at white and deepening the blacks) compensates.
The subtractive primaries do not really want to mix in this way. The fact that I was able to do so relies on the final compensating curve that pins white at white and drops black severely. I'm not sure that effect could be reproduced in the real world.
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