Auto Gradation Correction Control - Canon Color imageCLASS MF9170c Service Manual

Chapter 7

7.2.5 Auto Gradation Correction Control

imageCLASS MF9170c / imageCLASS MF9150c / imageCLASS MF8450c
Overview
Auto gradation correction control is to stabilize the gradation density features of image.
To execute, select [Adjustment/Cleaning > Auto Gradation Correction] in additional function mode.
It has the following 3 correction controls.
Item
Full Correction (PASCAL) This correction outputs a test pattern and the reader scans its gradation
density to adjust the gradation.
Quick Correction This correction adjusts the gradation by means of D-half control instead
of outputting a test pattern.
Copy Image Correction This correction outputs a test pattern and the reader scans its gradation to
mainly adjust the gradation of copy image.
Operation flow
Following flow shows the operation of correction control when any of full correction, quick correction or copy image correction is selected from the auto gradation
correction.
7-14
T-7-2
Description
Auto Gradation Correction
Copy Image Correction Full Correction
Test Printing 1
Scanning 1
Test Printing 2
Scanning 2
F-7-18
Number of test
Type of test pattern
pattern sheet
1st sheet: T-MIC
2
2nd sheet: high/low screen rulings
-
T-MIC
1
Quick Correction
Full Correction
Copy Image Correction
Quick Correction
0020-9652
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