Service manual

4.5.2 ACS (Auto Color Selection)
Auto color selection mode determines if an original is black/white or color.
Then black copy mode or full color mode is automatically selected to match
the original.
To recognize if the original has a color area or not, the RGB video signals
are compared. If the maximum difference among RGB signal levels
(MAX-MIN in the above diagram) is within a certain range, the original is
considered to be black and white.
During the 1st scanning cycle, the latent image is developed with the amount
of black toner as specified by the gamma-corrected RGB video signals. If the
original does not have any color areas, the 2nd scanning is aborted and the
developed image is transferred from the transfer belt to the copy paper and
then exits the copier. If the original has a color area, copying resumes in the
full color copy mode (4 scans).
Users can maximize the quality of their output by selecting priority for Bk or
Full color original in ACS mode, using a User Tool (the default is for Bk). The
Bk setting prevents the UCR process from reducing the image density too
much in low image density photo areas. This is explained in more detail in
the section on UCR; see section 4.5.4.(6).
Detailed
Section
Descriptions
IMAGE PROCESSING
SM 2-47 A166/A187/A189
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA