I discovered that my LCD monitor (Dell E176FP) was way too bright, so I adjusted the gamma up by editing my xorg.conf file to add a Gamma line as described an article on linux.com. In fedora 7, the xgamma program is contained in the xorg-x11-server-utils package.

Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "DELL E176FP"
DisplaySize 340 270
HorizSync 31.0 - 80.0
VertRefresh 56.0 - 75.0
Gamma 0.6 0.6 0.6
Option "dpms"
EndSection

I'll probably need to go back and relevel photos.