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How to blend layers to simulate real 'light'?


T

Tom11

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I have two layers. One is completely red (r255,g0,b0). The other layer is completely green (r0,g255,b0).

How can I make it so that if I lower the opacity of the green layer (which is above the red layer), to 50% that the result is completely yellow (r255,g255,b0)?

I've tried all the blending options, none of them achieve this basic effect. The closest I got was something that looked like a darker orange.
 
Why dont you just make a new layer with yellow rgb code and fill it in with that but in answer to your question set the blending mode to difference and you will get true yellow just make sure when selecting eye dropper tool to verify it in the top menu bar select all layers no adjustments
Untitled-2.png
 
Actually, the "normal" blending mode at 50-50 (that you tried) will give you the correct hue, but as you discovered, the luminosity will be too low. To fix this, all you have to do is put a "levels" adjustment layer on top of the stack and move the rightmost slider to about the midway position and you'll get an intense yellow.

Note - This approach has the disadvantage of producing a hyper intense yellow because it also increases the saturation. If you want a more natural yellow, just change the blending mode of the "levels" layer to "luminosity" instead of "normal".

Tom M
 
Attention:- Computer or PS or any software can't Mix the color, but you can play with banding mode.
 
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