Canon CanoScan D660U Canon Plug-in Module CS-U3.9 User's Guide - Page 21
Setting the Scan Mode, Black and White, Grayscale, Color - unavailable in control panel
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Setting the Scan Mode STEP 1 When an image is scanned, it is read as a collection of "dots." The scan mode that is selected determines how each of these dots is represented in the output. The following four scan modes are available. Black and White Expresses images in two colors only: black or white. A dot is expressed as either black or white according to its brightness level and the value set as the threshold value, which can be freely set. Select this mode to output to a monochrome printer. Grayscale Expresses images in 256 shades of gray. Select this mode to scan black and white photographs or create monochrome images from color images. Color Expresses each color channel (RGB) in 256 shades (8 bit). Select this mode to scan standard color photographs. Hint Scanning the same image in the four different scan modes produces different file sizes. By size, black and white mode requires the least disk space, followed in order by the grayscale and the color modes. Before scanning, check the data volume indicated on the control panel. The numerator indicates the amount of disk space required for the scanned image while the denominator indicates the amount of disk space available. When the required space exceeds the available space, the scan button is unavailable. 21