Slightly Uneven Densities That Occur In The Halftone Density Area Of A Printed Image - Canon imagePRESS C800 Series Troubleshooting Manual

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Chapter 1

1.1.1.3.2 Slightly uneven densities that occur in the halftone density area of a printed image

0031-5548
[ Manual-related ]
Description
This mode enables you to correct the slightly uneven densities that occur in the halftone density area of a printed image.
The following three types of shading correction can be made:
- Densitometer Correction:
This mode enables you to correct uneven densities by gauging the output results of the test page using a densitometer, and entering the displayed values for density
adjustment.
- Visual Correction:
This mode enables you to correct uneven densities by viewing the output results of the test page and adjusting the density manually. Select this mode to correct
uneven densities if the densitometer is unavailable or the densitometer correction is unsatisfactory. Note that sufficient experience in detecting slightly uneven den-
sities is required to manually adjust the density.
- Print Server Correction:
When the imagePRESS Server is installed, this mode enables you to correct uneven densities using the data received from the print server.
[Caution]
330 mm x 483 mm, 320 mm x 450 mm (SRA3), 305 mm x 457 mm, A3, or A4 (13" x 19", 12 5/8" x 17 16/11", 12" x 18", 11" x 17", or LTR) plain paper can be
used for test pages. Make sure that a sufficient supply of paper is loaded in the paper source before starting this procedure.
Field Remedy
a) To perform densitometer correction:
1) Settings/Registrations > Adjustment/Maintenance > Adjust Image Quality > Correct Shading > Densitometer Correction > press "Start Printing". Test page 1
with marks from 0 to 8 is output.
[Reference] The marks 0 and 8 may not be shown, depending on the paper width.
Test page 1
2) Gauge the mark on the output test page 1 using the densitometer.
3) Press "Fine Adjust" of the color you want to adjust.
4) Select the number > enter the gauged density value from the test page > press "OK".
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