Question How to implement blend mode "Color" in shader

I want to know how to implement the blend mode "Color" from Photoshop in shader.
Im using this but is not working as I expect.
https://github.com/penandlim/JL-s-U...nd Modes/CGIncludes/PhotoshopBlendModes.cginc

 

have you tried using shader graph?

https://docs.unity3d.com/Packages/com.unity.shadergraph@6.9/manual/Blend-Node.html

 

There is no Color blend mode in shader graph.

 

Sorry I assumed they implemented the same modes.

I found a shdertoy but I think is doing the same poerations than your shader:

https://www.shadertoy.com/view/XdS3RW

I also found an interesting pdf:

https://printtechnologies.org/wp-content/uploads/2020/03/pdf-reference-1.6-addendum-blend-modes.pdf

The formula and the methods are explained but I did not checked if is doing at the end the same as your shader.

Definitely Im interested in how this is developed, please share your findings!

 

That afore linked shader file explicitly says it’s a port of that ShaderToy.

Photoshop’s Color blend node works by converting both inputs from RGB to HSV, then lerping the H(ue) of the base to the overlay, and then converting back to RGB.

Annoyingly, Unity does not provide any Shader Graph nodes for conversion between RGB and HSV. (It does for the VFX Graph.) So you’d have to copy the HLSL code from the appropriate functions into one or several Custom Function nodes to do those conversions.

 

I could't find the exact math behind the Photoshop Color blend mode, but I made my own shader that works in almost the same way, the result are just a tiny bit different.

I don't know if you still need it, but for anyone who may need it later, here it is
https://github.com/veebe/ColorShader/blob/main/ColorBlendShader.shader