❏Dropout colors (monochrome reading only)
The dropout color is the color that is treated as white, and is not read during the scanning operation. On a color scanner a dropout color can be chosen from among green, red, or blue. Dropout color can be used to avoid reading a certain color of the document. For example, corrections written in red on a draft can be erased by specifying the red dropout color.
The settings of 10H, 20H, and 30H should be used only to intentionally specify a dropout color. To change from color scanning to monochrome without choosing a dropout color, use the value 00H.
When a dropout color is selected, the color attributes in the status byte indicate the selected primary color. The image data of a dropout color can also be used as the color image data of one of the separated colors.
Command Reference