How does colormatrix work and what does "similar to Adobe Flash" mean? I'm looking for a plain mathematical definition. How are the input vector(s), matrix and output vector composed? How is the matrix applied?
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Plain mathematical definition is it uses matrix multiplication. Here is an explanation with some examples: http://msdn.microsoft.com/enus/library/windows/desktop/ms533875(v=vs.85).aspx RGBA uses 5x5 matrix and CMYKA uses 6x6, but the idea is the same.
? is ignored. Here is the live matrix to experiment with: http://www.adobetutorialz.com/articles/1987/1/ColorMatrix 

