Brother MFC-250C Software User's Manual page 173

Scanning
Scan Type
10
Black & White
Use for text or line art images.
Gray (Error Diffusion)
Use for photographic images or graphics. (Error Diffusion is a method for creating simulated gray images
without using true gray dots. Black dots are put in a specific pattern to give the gray appearance.)
True Gray
Use for photographic images or graphics. This mode is more exact because it uses up to 256 shades of
gray.
8 Bit Color
Uses up to 256 colors to scan the image.
24 Bit Color
Uses up to 16.8 million colors to scan the image.
Although using 24 Bit Color creates an image with the most accurate color reproduction, the image file
size will be about three times larger than a file created using the 8 Bit Color option. It requires the most
memory and has the longest transfer time.
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