The contrast algorithm for color images needs histograms so I will have to leave it for now and do histograms first.
I start with the histogram calculation function only, which only calculates a histogram, there is another function for drawing it. This was done based on previous suggestions from Larry: https://github.com/StefanStavrev/oiio/commit/6c7a7c121ae662e5ae348648c322bf789b95ee24 It compiles fine but I have not tested it. For that I will need to add the histogram drawing function, but first I need to get some feedback on this. I would suggest that you ignore details for now and just look at the API. Once API is approved I will add the histogram drawing function and will be able to test it in detail. Thanks
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