Does anybody know the math behind the Photoshop burn effect/blend mode?
Written by MM. Posted at 6:00 pm on November 3rd, 2009
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http://www.cplotts.com/2009/06/16/blend-modes-part-i/
What about that?
I prefer Paintshop but i think its just a multiplication of the R/G/B/-Value of an Pixel with a value below 1. See http://sol.gfxile.net/gp/ch05.html for description.
Just out of curiosity, what kind of an effect/blend is it? How does it work? Sample screens?
There are two ‘burn’ blend modes … Color Burn and Linear Burn.
Color Burn’s math is: R = 1 – (1-Base) / Blend
Linear Burn’s math is: R = Base + Blend – 1
The series mentioned above is part of a 3 part series … and part 2 points two more references on the blend mode math:
http://www.cplotts.com/2009/06/16/blend-modes-part-ii/
Also, if you want to pull out opacity from the Blend layer … the math gets more complex. This is a way of lessening the affect of the particular blend mode. I am about to post another blog post on the matter (i.e. blend modes and opacity). Contact me (via my blog) if you are interested in that.
I just finished that blog post on opacities and blend modes … if you are interested in the math for that:
http://www.cplotts.com/2009/11/06/blend-modes-now-opacity-aware/