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A-61122/A-61124 March 1999 E-5
Image enhancement filters
Image Enhancement filters are used to optimize certain maximum
characteristics.
The following Image Enhancement filter options are available for
the scanner/microimager 990 only.
• No (all-pass) filter — used when no enhancement to an image
is necessary.
• Fine Line (high-pass) filter — used to accentuate the fine
details of an image. This filter is typically used to enhance the
detail of an image which contains small print (i.e., point type).
This filter may inadvertently accentuate background noise.
• Text (band-pass) filter — used to enhance text in an image.
This filter is typically used when scanning documents
containing fine lines or small print (4-point type). This filter
effectively reduces background noise.
• Halftone Removal (low-pass) filter — used to enhance
images containing dot matrix text and/or images printed with
shaded or colored backgrounds using halftone screens. This
filter effectively reduces background noise.
The following Image Enhancement filter options are available for
the Document Scanners (5500, 7500, 9500) series.
• No (all-pass) filter — used when no enhancement to an image
is necessary.
• Halftone Removal (low-pass) filter — used to enhance
images containing dot matrix text and/or images printed with
shaded or colored backgrounds using halftone screens. This
filter effectively eliminates noise caused by the halftone screen.
Refer to Chapter 6
, Scanner-unique Commands
for a description
of the MX/Y/Z command.