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E-6 A-61122/A-61124 March 1999
Mixed mode/Error diffusion
Mixed mode/Error diffusion processing screens photographic
areas of a document to simulate gray levels, yet sharpens the
edges of text. It is recommended that mixed mode/error diffusion
be used when a mix of text, graphs, pictures, and colors in the
documents are being scanned.
Mixed mode/Error diffusion is not directly selectable. It is the
result of various image processing parameters being set at a
specific value (or within a specific range of values). Refer to
Appendix D,
Image Processing Parameter Defaults
for more
information.
• Threshold of 100 to 120
• Contrast greater than zero
• Screen of 3, 4, 16, 32, or 64
• Any of the Image Enhancements filters
• Noise filter disabled
NOTE: When mixed mode/error diffusion and Compression are
used together, negative compression (less than 1:1) is
more likely to occur.