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IMBRIGHTNESS(r;l;h;m) modifies the brightness of the RGB image in matrix r, setting pixels in each channel with brightness less than l (default 0) to 0 and those brighter than h (default 255) to 255; m defines the mode of adjustment (default 0 stretches brightness and 1 distributes brightness evenly across the range).

Updated on December 4, 2017

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