Re: Grayscale perception
Re: Grayscale perception
- Subject: Re: Grayscale perception
- From: Graeme Gill <email@hidden>
- Date: Tue, 06 Dec 2005 23:16:18 +1100
Mark Rice wrote:
Regarding monitors, all monitors have dithering in the algorithms. If they
didn't, how would one produce a scale containing 16.7 million colors in only
1280 lines of resolution? Theoretically, you could only produce 1280 colors,
which would definitley show quantization. Dithering is used to achieve the
effect of a smooth gradation.
(Assuming this isn't simply a troll...)
Umm - no. Modern monitors don't use any dithering. They generally have
at least 3, 8 bit D/A converters running into the the color channels.
2^24 = 16.7 million unique combinations of voltages. No, not all
voltages can be used simultaneously on a screen that contains 1-2 million
pixels of course, but each pixel location can have any color out of
the 16.7 million. Many video cards now have 10-12 bit D/A converters,
providing finer possible control over a CRT.
Graeme Gill.
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