You can mess with the gamma setting from the "settings" dialog.

I have played around with my graphics card's color settings, but I still don't get perfect results (the passport pages are still gray). Is there a way to fix it by going into the drivers?

Much better to use Glidos's own gamma setting. Then you don't have to keep changing it back and forth.

Glidos's gamma setting only seems to help a little though.

Isn't there a way to permanently get rid of the washed out colors effect, Rather than playing around with the gamma setting?

It has already been discussed -- the Voodoo version of the TR1 executable applies too much brightness and there's not much that can be done to balance it. The guys at Core probably thought it would make the original textures less saturated and more realistic.

You could try fiddling with colour adjustment: leave Glidos gamma at 1.0, go to you driver settings, reduce the brightness until you get a satisfying black level, then boost the driver's gamma and maybe the contrast as well. If you're using ATI Tray Tools, save your settings into a custom profile and see how it performs in-game.

Hold on, in dgVoodoo, there is no problem with washed out colors, does anyone know how dgVoodoo solves it?

I think dgVoodoo ignores the Glide gamma command, which can lead to it being very dark (that may not be the case, but I seem to remember thinking that before).

Anyway in Glidos, you can adjust the gamma to what ever suits you.

Well I saw some screenshots of UB running in dgVoodoo on another forum, and they didn't have any washed out colors, and it didn't look dark at all. Apparently, you only get washed out colors in dgVoodoo when mipmapping is enabled.

Ah screenshots. My screenshots from Glidos never show washed out colours, but that's because I always mess about with them until they look right in a photo editor. 😁

Anyway, mess with the Gamma.

I don't think the screenshots were edited.