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I don't use Delphi! but to answer your question here's what you can do, split the color planes of your image and convert each of them to the a binary cv::Mat, and then you can run the functioncountNonzero on those 3 binary images, you'll get how many pixel and then you can get the number of pixel in each plane. divide the result by the resolution of you image you'll you percentage. I hope that's possible in Delphi.
