Well, I wanted to share this. I edited /etc/X11/xorg.conf after reading /usr/doc/NVIDIA_GLX-1.0/README (appendix D) and I add :

Option "DigitalVibrance" "100"

in the nvidia device section
I restarded X and... WOW, I can say the colors are very better now, I suggest other users of nvidia to give it a try (values come from 0 to 255 for DigitalVibrance).

I don't see any improvement

I've used this option as well and was also happy with the results. I used a different setting tho.

There's some interesting stuff in README's

Who'da thunk it

what did u use?

sorry for that, for me this option gives fresh color to my old compaq monitor (CRT).

According to the notes I have - and these are the release 40 notes so they are a year or so old - the DigitalVibrance setting is an integer range from 0 (off) to 25 (full). I believe I set mine for between 10 and 15. I am running a gForce4 MX440SE. Perhaps the drivers have changed since these release notes or the later cards offer a different level or calibration. Maybe you can experiment with this smaller range. Something higher for your hardware or driver may default this option to off. I wish I could be more specific, but I haven't enabled this option in my current configuration. Perhaps I will tonight and let you know what I find.

S

I have a gForce4 MX440 too but with actual driver (5336) values for DigitalVibrance come from 0 to 255.

I'm running the new driver too. Haven't use this feature in a while tho.

Guess I should update my docs

Is there any kind of GUI program for editing it, not just editing the xorg.conf file? I'm running slack 10 if it matters.....

even if there is, just start up your favorite editor, save a backup copy, and read the comments carefully, and then go for it
you're using slack after all

with the new driver it comes with nvidia-settings type that in command line go to crt and play with it i turned it all the way up and gives everything more color to it