Ricoh A172 - Rgb Filter; Filtering; Auto Image Density Control (Full Color)

4.3 RGB FILTER
4.3.1 Filtering
To improve the image reproduction, the appropriate filter coefficients are
applied to the R/B/G video signals, depending on the selected image modes
(letter/photo) or the result of Auto Letter/Photo separation.
4.3.2 Auto Image Density Control (Full Color)
This mode prevents the background of an original from appearing on copies.
The Auto Image Density Level can be changed using the User Tools. (There
are 5 levels.)
When Full Color mode and Auto Image Density mode are selected, video
signals corresponding to the background are detected and their output level
is set to zero. The threshold for detecting the background can be changed
over 5 levels using the User Tools.
RGB Input
Filterin
g
ADS
(
Full Color
)
RGB Filter
RGB Output
(
to Color Correction
)
Threshold
RGB Input Data
RGB
Output Data
Detailed
Descriptions
SM 2-17 A172/A199