Filtering And Color Conversion - Ricoh Aficio Color 3006 Service Manual

IMAGE PROCESSING 24 February, 1999

Filtering and Color Conversion

(1) RGB Smoothing Filter
Photo Text
Before
After
A259D521.WMF
A259D515.WMF
A259D514.WMF
Depending on the results of auto text/photo separation (or depending on the
selected original mode), the appropriate software filters are applied to the RGB
video signals. The RGB smoothing filter is applied to photo areas; an edge
emphasis filter is applied to text areas.
(2) Background Density Control and ADS (Auto Image Density Selection)
a. Background Density Control
A259D524.WMF
A259D522.WMF
This function removes low ID image signals (background) that are less than a
certain threshold. The threshold that is applied depends on the color mode (single
color or full color). For each of these modes, the user can select a different
threshold.
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