Convert between color spaces

Development Rendering
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1

How to convert SceneTexture:Input from one color space to another with custom convert matrix?

I have several matrices for different color spaces, and they work fine in OpenCV. It looks like:

cv::transform(img_RGB, img_lms, RGB_to_LMS);

So I want to make same stuff but in UnrealEngine. I saw “Custom” node in material blueprint, but dunno what syntax it uses and what functions it has.

2

The custom node uses HLSL syntax. As for what functions you have access to (apart from the basic HLSL functions), that is a bit harder, as you would have to dig into the unreal shader code to see what functions they made there.