Microtek C593 User Manual page 9

Use the selection key to select the icon, then press - or +. The screen
below will appear.
Use the selection key to select the CONTRAST field, then press - & + to
get the best contrast optimization. You can adjust R,G,B simultaneously or
adjust each Red, Green, and Blue channel separately. You can also use this
field to change purity of the RGB levels.
Use the selection key to select the COLOR BALANCE field, then press - &
+ to get the best color balance effect or to separately set the RGB color
values. You can also use this field to change intensity of the RGB levels.
The easiest way to adjust the contrast and color balance setting is to use
auto-balance.