Brother DCP-7060D Software User's Manual page 166

Scanning
Scan Type
 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 grey images
without using true grey dots. Black dots are put in a specific pattern to give the grey appearance.)
 True Gray
Use for photographic images or graphics. This mode is more exact because it uses up to 256 shades of
grey.
 256 Color
Uses up to 256 colours to scan the image.
 24bit Color
Uses up to 16.8 million colours to scan the image.
Although using 24bit Color creates an image with the most accurate colour reproduction, the image file
size will be about three times larger than a file created using the 256 Color option. It requires the most
memory and has the longest transfer time.
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