Since my laptop (Toshiba Satellite M200) cannot adjust the brightness using fn-key. Therefore, I set the brightness using Intel display driver graphics properties. Adjust the colour at the “color correction”.
However, when I play some games, and when the games are set to full screen, the LCD colour will be reset to the default colour. This is the problem. That means I need to right-click at the desktop to choose “Graphics Properties…” to adjust the brightness each time I play the game.
Then I found a freeware. Very good freeware, Gamma Panel. Very lite, extract it and you can run. All the settings are written in .ini file. Can set the hotkey to change the colour/gamma/brightness/contrast of your setting. Easy to use.