Brother MFC-3100C Owner's Manual page 126

Settings in the Scanner Window
Image
Resolution
Choose the scanning resolution from the Resolution pop-up menu. Higher resolutions take more
memory and transfer time, but can achieve a finer scanned image. (Each model has different
resolutions. See Specification.)
Color Type
Black & White—Set the image Type to Black&White for text or line art. For photographic images,
set the image type to Gray (Error diffusion) or True Gray.
Gray (Error Diffusion)—is used for documents that contain photographic images or graphics. (Error
Diffusion is a method for creating simulated gray images by placing black dots in a specific matrix
instead of true gray dots.)
True Gray—also is used for documents containing photographic images or graphics. This mode is
more exact because it uses up to 256 shades of gray. It requires the most memory and longest transfer
time.
Colors—Choose either 256 Color, which scans up to 256 colors, 24-bit color which scans up to 16.8
million colors. Although using 24-bit color creates an image with the most accurate colors, the image
file will be approximately three times larger than a file created with 256 Color.
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Chapter 18