On Fri, 28 Feb 2003, Ian Molton wrote:
>
> The human eye cant do better than 9bpp, and thats in its most sensitive
> colour, green.
That wasn't true the last time somebody claimed this, and it's not true
now.
Why do people keep on repeating this crap?
No, the human eye may not be able to distinguish more than 9 bits of
green, but that's totally beside the point. Humans have better sensitivity
to luminance than color per se.
Besides, you easily need a few extra bits to be able to correct for things
like gamma - allowing the gamma to "shift" the brightness without losing
information.
Why do you think _all_ reasonable digital cameras have at least 12 bits
per channel? The photo-crazy people really prefer 16 bits per channel (and
to get the range, they actually seem to prefer FP).
> 8,9,8bpp modes would be as good as is ever required.
Please don't perpetuate this bogus claim. You want more just for simple
gamma correction. And if you want to actually run _filters_ on these
things, you need to have more intermediate precision.
Why do you think modern 3D hardware does 16-, 24- and 32-bit per channel
FP? Do you think they _enjoy_ using 100+ million transistors and 75 watts
of power? It's because you need to support progammability without losing
dynamic range.
Linus
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