Inverting the Color (Nega/Posi)
You can configure the settings to invert the color and gradation of the entire original. This is convenient when copying an original that is difficult to see.
1
On the copy screen, press [Options] 
[Nega/Posi]. Copy Screen
[Nega/Posi]. Copy Screen[W/Settings] is displayed at the bottom of the setting button.
2
Press [Close].
The copy screen is displayed again.