#Setting r3 gamma
4 messages in this thread
David S. – Gary has already spoken with Truevision, check the gamma
correction thread 2 days back. All the details are there. You can
turn Gamma off, its fairly straightforward. -JE
John,
I've been following this and have tried only using Tmode 11
(after removing a Tconfig batch from my autoexec.bat and rebooting)
but something's still goofy. Setting the framebuffer gamma to 2.1
gives me the best results, and this is what I've got it set at
presently. The outer box at 2.1 is dark gray and the inner box is a
much lighter gray. If I slide it down to 1.0 they get closer, but the
inner box is still a lighter shade than the outside. When I set it to
1.0 and view various renderings, the images are much too dark.
The targa is going straight to an RCA colortrac NTSC monitor
with an S-video hookup. Is it possible that the monitor is doing some
sort of gamma correction on its own? I don't have time at the moment
to pay too much attention to this, but I'll be taking some major time
off starting in a few days, so I'll do some fiddling then (trying
different monitors, laying stills to tape to compare output, etc.).
Until then I'll keep my eyes open here. Thanks for your help.
David
P.S. Is anyone else still having trouble matching those annoying
little squares? The display gamma squares match perfectly at 1.8, but
even though the framebuffer output looks great, something in the back
of my head says somethings not right if I can't get a match!
David – The monitor seems to be the only difference between each
system. I suspect some monitors are doing some strange things. If
your frame buffer output looks good, leave the setting where you have
it. Then do some recording to tape. Check the output to tape on
playback through your NTSC monitor, if it looks good, then your
framebuffer setting is probably pretty close and you probably won't
be able to use gamma adjustment on your NTSC monitor. I'd strongly
recommend getting a RGB monitor for your framebuffer, this would
enable you to set gamma correctly. -JE
David,
First of all, I'm not a video engineer, and I haven't been able to
reach mine yet to confirm all this, but here are some of my
observations. Observations may be all we have to go on this since we
are working on NTSC (never twice the same color). For testing
purposes, I've hooked up every tv and monitor I own, and the only one
that seems to be able to be gamma corrected properly with T11 6 or
tconfig is my the monitor I'm using for my primary video display, a
Sony PVM-1344Q, which I can gamma correct in composite, s-video, or
RGB. Whereas, my Mitsubishi, which is supposed to be a high quality
s-video monitor, no matter where I put the sliders, it doesn't seem
to help. I have another Mitsubishi which is better, and a large
screen Sony which is about the same. This indicates to me that some
monitors/tvs are so far off they shouldn't be used as final output
test color barometers. I originally bought the Sony because when I
was taking my stuff into some video houses, my output colors weren't
matching what they were seeing. This Sony series is very widely used
in video production. An additional observation is that setting the
gamma to 2.2 does make my final output look better on even the
Mitsubishi. Hope this helps.