Avision AV3200C - Manual (Page 29)

4-6
8-Bit Gray
A single-channel image consists of at least 256 shades of
gray. An 8-bit scanner produces a grayscale image with 1024
shades of gray between pure black and pure white. Choose
this option if you are scanning black-and-white photographs.
With 8 bits of color information per pixel, the file size of an
image is eight times larger than a Black and White image and
1/3 the size of a 24-Bit Color image.
Gray Image