View Full Version : Blend RGB colors with Gamm: 1.0 in Phtoshop

08-10-2013, 11:30 AM
Attempting to composite reflections in PS since clients are always telling me to ease them down, I came across a roadblock when using Linear Dodge (Add) Blend mode on Photoshop. As long as I kept the file on 32-bit it would give the proper blend, but not at 16bit...

Digged some and so I found out about this option in Photoshop, Color Settings, More Options, Blend RGB Colors Using Gamma: 1.0.
https://dl.dropboxusercontent.com/u/143766132/Forums/NewTek/PSCS_tn.jpg (https://dl.dropboxusercontent.com/u/143766132/Forums/NewTek/PSCS.jpg)

Now I could add my specular and reflection with the proper blending. Also I noticed it affected a bunch of things like Gradients, Blurs, Soft brush strokes, Layers's alpha.

Here's some examples
https://dl.dropboxusercontent.com/u/143766132/Forums/NewTek/Layer-blends_tn.png (https://dl.dropboxusercontent.com/u/143766132/Forums/NewTek/Layer-blends.png)

I was a bit mind blown. Maybe some other render newbie out there will be too :D
After Effects has this option too!


08-12-2013, 04:19 AM
Actually... This option for correct layer blending only works in After Effects -____-' The other effects still take place.
In PS seems the only way is to either use a color profile with Gamma set to 1.0. This of course brings some disadvantages when one doesn't want linear gradients to be de-gammaed and so on.

Gamma and Alphas... PS pitfalls