Gamma Panel is a little & handy application that lets you adjust
brightness,
contrast and
gamma settings in real-time. Thanks to its
hot-key feature,
you don't even have to leave the game you're playing! The program works pretty similar to
Color profiles in
PowerStrip
but is completely free and much smaller in terms of system load and memory usage.

The program is pretty simple - it just sits on the taskbar and does its job.
You can apply profiles in 2 ways: by pressing assigned hot-key combination or by
selecting the entry from the popup menu. The last selected color profile is automatically
applied on the next program run.
The profiles can be added, modified or removed in the main window (click on the tray icon and select
Settings):

The controls are pretty self-explanatory.
LUT is the maximum possible number of different colors that can be reproduced.
The largest number is 16'777'216 so you can see the loss in color resolution when applying any correction.
Note: Pressing Esc key resets the display controls
to their default position - it might be very useful if you set the brightness too high or too low and you don't see anything.
All the settings and profiles are stored in
gapa.ini file so you don't need to have administrator rights to run or install the program (it doesn't write anything to the registry).
The .ini file is saved in the current working directory so you can use as many configuration files as you wish.
Just change the working directory in the shortcut and the program will read and write its settings to a different file.
The program has been tested and found to be working without any problems with:
- Microsoft Windows 98SE
- Microsoft Windows XP
It uses only standard Win32-API calls so it should work well with any other version of Windows.
Let me know if you encounter any problems - I'll try to fix it as soon as possible.