Acs (Auto Color Select) - Gestetner B147 Service Manual

ACS (Auto Color Select)

R G
RGB signal after scanner γ correction
B146D511.WMF
The Auto Color Select determines if an original is black/white or color. Black copy
mode or full color mode is automatically selected.
Selection is made based on the difference between the RGB signal levels.
RGB video signals are compared.
If the maximum difference among RGB signals is within a certain range, the
original is considered black and white.
SM
255
0
B
(40% UCR rate)
6-29
IMAGE PROCESSING
Black and white first
204 (50% UCR rate)
153 (50% UCR rate)
Color first
RGB common data
102 128 255
(50% UCR rate)
B146D510.WMF
B147/B149/B190