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by jacquesm
4400 days ago
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It's probably a bit old-school for you but let me explain. The RAMDAC in an 'original' old style VGA card only had 6 bits per channel, and 256 LUT positions (also called the 'palette'). This allowed you to select 256 colours out of a maximum of 262144 colours, or 2^18. So the maximum output value was 252, or hexadecimal FC for each channel. You can't really output 24 bit ('truecolour') then because every colour channel will miss the lower 2 bits, and what should be 'white' will be slightly grayish and so on (white then becomes hex 0xfcfcfc). Does that explain it adequately? |
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