Avision AV8000S - Manual (Page 27)

5-6
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