Brother MFC-3420C - Manual (Page 19)

USING THE MACHINE AS A PRINTER 1 - 11
Color
Color/Grayscale
This selection allows a color original to be printed in black and white
using gray scale.
Image Type
The printer driver will select the most suitable color matching and half
tone method, depending on your image type. Generally, text and
business graphics are printed vividly and photographic images are
printed softly.
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Auto: The printer driver automatically selects the image type.
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Photo: Select this mode for photographic images.
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Graphics: Select this mode for originals that contain text or
business graphics (charts or clip art).
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Custom: If you want to select the color matching and halftone
method, manually select this mode.