Maybe it already does. Somehow this comment isn't dead: https://www.hackerneue.com/item?id=7791436. Not sure what it means, though.
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?
I wish it would be possible to vote on his posts, even though they are "dead". Maybe individual posts that get enough upvotes can be unbanned, or maybe certain users with enough karma can unban selected posts manually?