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Re: [Public WebGL] WebGL support for high bit depth rendering & display



On 12/09/20 16:37, Matt McLin wrote:

Also, for any that doubt the benefit of > 8-bits per channel, consider this link:
http://download.microsoft.com/download/5/E/6/5E66B27B-988B-4F50-AF3A-C2FF1E62180F/GRA-T583_WH08.pptx
See slide 48 in this presentation on just-noticeable-differences vs. luminance from WinHec 2008.  You see that 8-bits was sufficient for low luminance levels of early displays, but as luminance increases, people are able to discern between 9 and 10 bits.  I have looked at the difference between 8, 9, and 10 bit gradients myself many times, and can vouch for its visibility on a good display.  

When the data is coded linearly, you need 14-bits to display what a human will perceive as a completely smooth gradient. With non-linear (perceptually uniform) coding , e.g. sRGB, this can be achieved with 9 bits. See
http://www.poynton.com/notes/colour_and_gamma/GammaFAQ.html#smoothly_shade 

Regards

    -Mark

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