Quote:
Originally Posted by Placidus
(1) Subtract the brightness of the black background. This is the same as setting the zero point or the black point. The way I do it is to look (with extreme accuracy) at the histogram, and find the darkest value that has a relative frequency above zero. That is exactly the same as subtracting the brightness that causes the "foothill" of the histogram to touch the y-axis.
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Not sure I know what you mean by "Relative frequency above 0".
Is this right (see attached)?
Note: logarithmic y axis on histogram.