Please explain the "Cumulative Mode" of the histogram

Thanks.

Cummulative mode maps all the histogram values from the standard bell curve to a range of 0-1. You can think of it as the bell curve being folded over on itself where the peak values in this case are on the upper left of the curve and the low values are on the lower right. So pure black 0 and pure white 255 (in 8 bit color) are represented as 0 in the cummulative histogram. It is used primarily for adjusting contrast.

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