Convert color and gray images to black and white (Scan/Open Image tab, Tools>Options menu)
Select the Convert color and gray images to black and white item if you wish to scan your images in grayscale using the TWAIN-Source interface and the scanned images contain no color pictures, colored fonts or backgrounds, or you do not wish any colors to be retained on the scanned images. The scanned images will occupy less disk space if you select this option.