Canon imageRUNNER C3489 Reference Manual page 228

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Adjusting the Machine
(Additional Functions) ➞ [Adjustment/Cleaning] ➞
Press
[Character/Background Contrast Adjustment].
You can adjust the relative contrast (brightness) of the hidden text and the
background when using the Secure Watermark mode.
Press [For Printer 1200 dpi] or [Standard].
Press [For Printer 1200 dpi] if the resolution is set at 1200 dpi during printing.
NOTE
To print at resolutions of 1200 dpi using the Color imageRUNNER C2550, the
1200dpi Print Expansion Board is required.
Select the color ➞ press [Sample Print] ➞ [Yes].
The setting range for the Relative Contrast Value will differ, depending on the
Standard Value Settings you have set.
Standard Value Settings
0
4
8 to 56
60
64
NOTE
•
If adjusting the contrast of the background and characters (latent image), specify
the relative contrast value.
•
The area within the frame on the sample print is the output sample for the currently
set relative contrast value.
Relative Contrast Value
0 to +7
-4 to +7
-7 to +7
-7 to +4
-7 to 0