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On Sat, 07 Nov 2009 21:19:50 +0100, Chambers <Ben### [at] gmail com>
wrote:
>
> The second issue is harder to deal with. I've been trying to calibrate
> the colors on the TV, and it doesn't seem possible to get a good setup
> for it. No matter how I adjust things, some programs look good while
> others are either washed out or too dark.
>
> I don't know how else to describe it, other than that there seems to be
> some fundamental differences in the color space between PCs and TVs that
> the traditional gamma / brightness / contrast settings can't account for.
Video in Y'UV/Y'CbCr colour space is generally compressed to a smaller
luma range (16-235) than RGB signals (0-255). A TV may expect different
luma ranges depending on the type of input signal. When you display video
from a computer, the source data can be in either range, the playback
software may or may not try to compress/stretch the luma range for output,
and the video card/driver may or may not alter the range as well. The
latter two are controllable, but the first one will inevitably vary.
--
FE
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