Toner Color Correction Circuit; Coloring/Contour Processing - Canon 1130 Service Manual

CHAPTER 4 IMAGE PROCESSING SYSTEM
J. Toner Color Correction Circuit
Ideally, each color toner should absorb 100% of light of specific wavelengths and reflect light
of all other wavelengths. In reality, however, areas indicated by a, b, and c in Figure 4-410 exist,
requiring color correction on reflection characteristics by a color correction circuit.
The Bk signal is generated from the UCR signal while correction takes place.
K. Coloring/Contour Processing
In the coloring/outline processing block, image data is processed/edited according to
instructions on specific colors or areas selected on the control panel or the editor. A selected area is
divided into a text area and a background area (area without image data), and the text area is further
divided by the IP-ED PCB into a character body area, character contour area, and shadow area,
each of which is subjected to the following image data processing/editing.
1. Paint
The area is filled with the selected color.
2. User Color
The image data of the selected area is converted into data of the selected color.
3. Gradation
The selected area is colored by varying the ratio of composition of two selected colors.
4. Color Filter
The selected area is colored by modifying the image data using the data of a selected color
at a default ratio of composition.
4-12
COPYRIGHT © 2002 CANON INC.
Light reflected
by toner
a
Figure 4-410
CANON CLC1100/1130/1150/1160/1180 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
c
b
(nm)
Wavelength (nm)