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Two issues, one of them straightforward, and the other... not so much.
For reference, I'm connecting through an HDMI cable from my motherboard
(onboard graphics), and running a 32bit color desktop.
First of all, it appears that my TV has a 17 bit DAC for color
reproduction (6-6-5). This can be verified by trying to "nudge" RGB
colors by 1 unit; nudging either red or green produces a noticeable jump
every fourth step (but no change in between), while nudging blue
produces a jump every 8th step.
I'm actually switching to a better TV next week, but I don't know how to
find the bit-depth it is capable of displaying. I've tried various
words and phrases on Google, but it appears this information is not
readily available. Does anyone have a suggestion for where I can find
this information?
For reference, the TV I have now is a Sylvania LC320SS9-A, a 32" 720p
set. The TV I'm going to get is an LG 47LH30, a 47" 1080p set.
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.
Has anyone else here had experience using an HDTV as a monitor, and do
you have any suggestions for the color calibration?
...Chambers
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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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