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A-61510 January 2005 3-8
When Adaptive Thresholding is selected, Contrast values may
range from 1 to 100. A Contrast value of 100 is considered fully
adaptive thresholding.
Fixed thresholding ATP
disabled
ATP enabled
Fixed Processing used for black-and-white and other high contrast
documents. A single level is set to determine the black-and-white
transition. The threshold is programmable over the entire density range.
Fixed thresholding sets contrast to 0. If Fixed Processing is selected,
Contrast is not available.
Error Diffusion screens photographic areas of a document to
simulate gray levels yet sharpens the edges of text. It is recommended
that error diffusion be used when a mix of text, graphs, pictures and
colors in the documents are being scanned.
NOTE: When using error diffusion and compression together, negative
compression (less than one-to-one) is more likely to occur.
64-Level Bayer Dither, 64-Level 45 Degree Clustered Dot Screen
and 64-Level Dispersed Dot Screen these represent alternative
screening options to emulate gray.