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Good question, I don't know of a good resource that combines a lot of what I would call "compositing math". In this case I looked at the blender source as well as the natron source, though both work slightly differently than the nuke IBK and the rest was just guessing what the nuke node might do. Note that my node is still missing some useful math from the IBK node, such as using bkg luma and chroma. I might revisit this and try to figure out what else it's doing, but I'm really just trying operations, usually with a color wheel, to see whether I get the same result as the IBK.
Good question, I don't know of a good resource that combines a lot of what I would call "compositing math". In this case I looked at the blender source as well as the natron source, though both work slightly differently than the nuke IBK and the rest was just guessing what the nuke node might do. Note that my node is still missing some useful math from the IBK node, such as using bkg luma and chroma. I might revisit this and try to figure out what else it's doing, but I'm really just trying operations, usually with a color wheel, to see whether I get the same result as the IBK.