display settings

[Marek Kozlowski <kozlowsm mini pw edu pl>]

:-)

I'm using the GNOME 2.18 (Gentoo with up-to-date stable ports) on my IBM 
ThinkPad T42 (ATI Radeon 7500 graphics card) notebook. The notebook is 
quite old but still works *almost* perfect. *Almost* because I have some 
problems with display properties. The color balance is quite wrong 
("much too green") as well as the saturation and contrast need to be 
adjusted.
The hardware of the display (I mean: the notebook buttons) allows 
changing only the brightness of the display while xorg.conf settings 
allow changing the rgb *gamma* values. It's not enough for me. For some 
multimedia applications I can adjust the desired values. I wonder if 
there is some GNOME application that allows changing desired display 
parameters for the whole desktop environment. I guess it *should* be, 
unfortunately I can't find it :-(

Thanks for any help,
best regards,
Marek Kozłowski