1. "Unfortunately C arrays don't come with a size, so you'll just have to assume that the user has done the right thing here."
I can compute the size with sizeof. I don't like passing array size as separate parameter, which is one of the reasons I used vectors in the beginning. 2. "I'm happy with this API, apart from not knowing whether a per-channel pivot is really necessary." If we allow contrast per channel, it won't cost anything at all in terms of implementation complexity to allow for pivot per channel also.
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