Xerox Document WorkCentre 450C - Manual (Page 164)

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Resolution
Sets the scan resolution. Options are fine (200 x 200
dpi) and superfine (300 x 300 dpi). Superfine is
recommended for OCR processing.
Color Depth
Specifies the number of bits per picture element
(pixel) at which the scanned image is stored in a file.
Options are black and white and 16 shades of gray.
Black and white is recommended for OCR
processing.
Contrast
Adjusts the lightness and darkness of the scanned
document. Options are darken, normal, and lighten.
Apply Halftone to Photo
Processes a photographic image into halftone dots.
Use this option when scanning original photographs
and using black-and-white color depth.
5. Click OK. The WorkCentre begins scanning the
document.
For information on how to use TextBridge, see the
TextBridge documentation.