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The banding you see is from image and video compression, not a lack of bpp. Human beings can almost never differentiate 6 bpp from 8 bpp grayscale, and with co
by mgraczyk 13y ago
The banding you see is from image and video compression, not a lack of bpp. Human beings can almost never differentiate 6 bpp from 8 bpp grayscale, and with colors 7 bpp/c is almost always sufficient.
- modeless 13y agoThis is true, but transmitting video at 8 bits per channel is problematic because it's too close to the threshold of perception. Any video processing you do on an 8 bpc signal is likely to introduce visible artifacts, and of course today's TVs go crazy with ridiculous video processing even at their default settings before people start playing with the brightness and contrast controls. We need to be transmitting video at 12 bpc so that video processing done at the display doesn't destroy the signal.
- mgraczyk 13y agoI tend to agree, but I would prefer to discourage television manufacturers from doing any more "improving" than they are already doing. If you're sending a signal to a display with the signal so little compressed that 12 bpc would be an improvement for post processing, then you're probably sending the signal straight from a BlueRay player or desktop graphics card. In both of those cases, I'd rather my TV not do any post processing. (Brightness and contrast on TVs are analog operations and do change with changes in bit depth. Higher brightness = turn the lights up, not a pointwise linear map)