found this online and thought back to our confab about exposure
"There are 4096 tones in a greyscale RAW image...If you divide the histogram in to 4 sections, the section on the far right (highlights) has 2048 tones, right from centre has 1024 tones, left of centre has 512 tones and far left - in the shadows has only 256.
So, by over exposing slightly, you are increasing your tonal range and therefore the final post processed output of the image."
"There are 4096 tones in a greyscale RAW image...If you divide the histogram in to 4 sections, the section on the far right (highlights) has 2048 tones, right from centre has 1024 tones, left of centre has 512 tones and far left - in the shadows has only 256.
So, by over exposing slightly, you are increasing your tonal range and therefore the final post processed output of the image."

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