posterizer effect

On macOS there are the QC Posterize and CI Color Posterize actors, but they're not ours, we just pull them in from Apple's architecture and they're ancient and inefficient so I usually recommend not using any of the CI or QC actors. If you do go down that route you'll want to use the Video Converter actors (GPU to CI, GPU to QC, CI to GPU, and QC to GPU) to make sure you're using GPU video wherever possible.

Maybe a GLSL Shader?

https://www.shadertoy.com/resu...