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A-61510 January 2005 4-10
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
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.
Dithering a method used to simulate gray levels. The following
Dither options are available:
• 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.