Ah yes, sorry.
This is the signature:
ImageBufAlgo::contrast (ImageBuf &R, const ImageBuf &A, float contrast,
ROI roi, int nthreads)
and this is what it does for grayscale images:
r[0] = clamp (a[0] * contrast, 0.0f, 1.0f);
where r is iterator over R, and a over A. Dead simple.
The algorithm for color images is:
r = (r-128) * contrast + 128;
g = (g-128) * contrast + 128;
b = (b-128) * contrast + 128;
This assumes we work with unsigned char in range 0-255, but
I can remap to other range if needed.
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