Bell and Howell 500 FB, Руководство оператора

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SCANNER FEATURES
A-7
Multi-value scanning
Function Multi-value scanning can record 4, 6, or 8 bits of information for
each dot on the image. The 4-bit multi-value data represents 16
different shades of gray, the 6-bit data represents 64 shades of
gray, and the 8-bit data represent 256 different shades of gray.
Therefore, an 8-bit scan of an image requires eight times more
space than a binary (1-bit) scan of the same image.
Usage Use multi-value scanning to scan an image that contains gray
shading (for example, a photograph) when you want to print or
display the image on a gray scale device. Select 4-bit, 6-bit, or 8-
bit depending on the gray level capability of your output device.
Original
4-bit image
8-bit image