I think contrast is ready for a pull request: https://github.com/StefanStavrev/oiio/commit/5258d961c8796c423d4ae7745d7685e97e856bd3
I tested it and here are some results: Contrast applied to all channels with values 0.5 and 2: http://postimage.org/image/t3dagdu7p/ http://postimage.org/image/kjw8uy39v/ and applied to luma with values 0.5 and 2: http://postimage.org/image/ky268acr7/ http://postimage.org/image/7l9d3v46h/
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