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6. Appendices
48
Gray Scale Scanning
Glay Scale scanning converts an original into image data consisting of 4-bit or 8-bit gradations.
Four bits can express 16 gradations, and eight bits can express 256 gradations. This function is
used to output an original that contains intermediate tones on an output device that can express
intermediate tones for a single pixel, such as a display or a Dye Sublimation printer.
Although a higher number of bits produces higher image quality, it is important to remember that
the processing time will be longer. For example, when an area is scanned using the 8-bit multi-
scan mode, it requires eight times as much memory as when scanning the same area through
binary scanning or halftone scanning.
180 LPI70 LPI 95 LPI
Original
4-bit image 8-bit image