What 8-bit vs. 16-bit color really means

Started Nov 19, 2012 | Discussions thread
Bob Collette
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Re: What 8-bit vs. 16-bit color really means
In reply to rpenmanparker, Nov 19, 2012

Robert, I agree with you.  In my opinion, one of the biggest advantages of working in 16-bit/color mode is that if you do an "Adjust Levels" where you change the Black point, White Point, or Gamma, you can still get a "smooth" histogram.  If you adjust the Black/White/Gamma in 8-bit/color mode and then view the image histogram, it will likely have "holes" in it, where there are digital code values missing from the image.  This can cause visible artifacts in the image.

However, if you adjust the Black/White/Gamma in 16-bit/color mode and then view the image histogram, the histogram will still look "smooth" as it originally did (before the Levels adjustment).  When the image is converted back to 8-bits/color, all 256 levels will be present, since Photoshop will select the optimum 256 levels out of the 65536 possible levels.

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