Trying to use a multiplying blendstate to get results like image editors.

[KakCAT]

This may be helpful:

Playing with BlendState vs Photoshop Blend Modes

So I am new to the math behind the blending and how it works with the BlendState. When I tried to create an overlay BlendState I ran into problems. As practice to figure out how it works I decided to try and translate the formulas I found at Insight into Photoshop 7.0 Blending Modes to BlendStates where I could. However I soon found that this seems to not be possible using BlendStates in most cases (just darken, multiply, lighten and linear dodge). Below is a list of what I have come up with s…