Description
Contrast affects the amount of difference between black and white used by the screen. It affects only the game's colours and if changed will increase / decrease brightness of the colours on the screen. Artwork and MAME's menus are not affected.
Example
mame <gamename> -contrast 1.5
Command Format
<gamename> -brightness <decimal number> where the number is the amount contrast is applied . The example will give brighter colours if used.
MAME's Default Setting
1.0 (Min 0.1 / Max 2.0)