Density Processing; Outline - Canon GP605 Service Manual

CHAPTER 4 IMAGE PROCESSING SYSTEM
F.

Density Processing

1.

Outline

The digital image processing block performs the following density processing:
[1] LOG conversion
[2] Density correction
[3] AE processing
[4] Density adjustment
[5] Density adjustment during printing
Of the foregoing functions, 1. through 4. are performed when scanner input image data is being
read, and 5. is performed when printing scanner input image data/PDL input image data.
Multiple-value data
Density adjustment
when reading data
Density adjustment (F value table)
Density adjustment
Density adjustment (laser power/developing bias)
when printing data
4-12
COPYRIGHT © 1999 CANON INC.
Volume 3>Chapter 4>IV.G.1. "Logarithmic Correction"
Volume 3>Chapter 4>IV.G.2. "Density Processing"
Volume 3>Chapter 4>IV.G.2. "Density Processing"
Volume 3>Chapter 4>IV.G.2. "Density Processing"
Edge emphasis
AE processing (AE table)
LOG conversion (LOG table)
Density adjustment ( table)
Binary processing
Binary data
Figure 4-304 Flow of Density Processing
Identifies the type of original by
pre-scanning, and selects the best AE
table. (AE with priority on image quality)
Converts image signals possessing intensity
data representing reflected light into image
signals possessing data representing toner
density.
Selects an F value table to suit the Copy
Density key setting on the control panel.
Selects a table to suit the text, text/photo,
or photo mode setting.
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)