Printer Output Image Processing - Canon iR C2880 Series Service Manual

4.5.3 Printer Output Image Processing

iR C3380i / iR C3380 / iR C2880i / iR C2880 / iR C3580 / iR C3580i / iR C3080 / iR C3080i
The main controller processes the image data arriving from the reader unit for output to the printer unit.
Here, the Bk signal is generated
if an ACS session identifies the
original as being black-and-white.
(Otherwise, it is let through.)
In color mode, the Bk signal
is generated here.
For the text area,
UCR processing is executed.
A correction LUT is prepared
as part of PASCAL control.
To DC controller PCB
Reader unit
RGB
Main controller PCB
(main + sub (R-A)/
(sub PDRM-PE-A)
RGB
- Background removal
- Bk generation
RGB->CMY conversion
Output direct mapping
- F value adjustment
- Color balance correction
Output gamma correction
Optimum screen selection
Smoothing
- Framing
- Blanking
CMYK
- Image data
Y,M,C,Bk
serial/parallel conversion
- Video count
F-4-9
24
24 Image area
signal
CMYK
Image area
32
signal
Chapter 4
0013-9217
4-11