Canon imagePRESS C7011VPS Handbuch

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After you finish
In the exceptional case where the manual shading correction does not deliver the required color
quality, do the following:
1. Touch [System] -> [Color adjustment] -> [Manual shading correction].
2. Touch [Set all to 0].
3. Perform an automatic shading correction. 
4. Continue with the manual shading correction.
Perform a manual shading correction
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Chapter 14 - Maintenance and print quality