Microtek C783 User Manual page 11

Note: We strongly recommend that you use this item to get optimum visual
quality.
Use the & key to select auto-adjustment, then press - or + to get the
optimized quality.
Use the & key to select the icon, then press - or +. The screen below
will appear.
• Use the & key to select the CONTRAST item, then press - & + to
get the best contrast optimization. You can adjust R,G,B
simultaneously or separately. You can also use this item to change
RGB purity.
• Use the & key to select the BALANCE item, then press - & + to
get the best color balance effect or to set the RGB color values
separately. You can use this item to change RGB intensity.
Note: The easiest way to adjust contrast and color balance is to use the
auto-balance item.