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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
