Often, the brightness control on a monitor is boosted to compensate for images that look dim due to a lack of gamma correction. Before applying gamma correction, the monitor brightness should be adjusted so a blank screen looks black in typical viewing conditions. Next, display a picture that is predominantly black, and adjust the brightness so that the monitor reproduces true black on the screen. The brightness should be adjusted to the threshold where it is not so far down as to "swallow" codes greater than the black code, but not so high that the picture sits on a "pedestal" of dark grey. When the critical point is reached, leave the brightness control in that position. Then set contrast to suit your preference for display intensity. How to run the Gamma Correction Tool
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Note: You do not need to have superuser privileges to use the gamma correction tool.
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To use the gamma correction tool, execute the following command:
/opt/graphics/common/bin/gamma
If you get the error "Can't open display", set the DISPLAY environment variable by executing this command:
export DISPLAY=:0.0
How to Install the Gamma Icon Into your CDE Front PanelIn a terminal window, go to your home directory and follow these steps:
1. Execute this command:
cp /opt/graphics/common/icons/Gamma.* $HOME/.dt/icons/
2.Select the 
Applications Icon on the CDE Front Panel.
3.Double click the 
"Desktop_Apps" button.
4.Double click the 
"Create Action" button.
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