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file:///C|/Documents%20and%20Settings/Miz%20B/My%20D...0UGTA/Nuvera%209.0%20UGTA_FINAL/English/psg_iq30.htm8/13/2008 2:37:20 PM
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System Tour
Correcting Posterization
(when scanning or copying)
Obvious "stair-stepping," or sudden shifts in tones, rather than
smooth transitions in areas of tonal gradation (see left half of
figure), is called Posterization. It results because of a lack of
available gray levels. The number of gray levels is determined
by the number of dots in a halftone cell.
To correct posterization:
If you are copying or scanning a halftoned or photographic
image, and getting posterized output, try the following:
1. On the Home Screen, click Copy.
2. On the Image Quality tab, click the Original Type
button and make sure Mixed Text and Graphics is
not selected.
3. If satisfied with settings, click the <Copy> button.
Other options include:
Scan at a higher resolution.
Select a Original Mode with low contrast.
or
Use the Contrast Control to lower the contrast.
For more details about posterization, see
and Gray
Levels.
TIP: If you have programmed and run a job, and
received unexpected results, ensure that the system-
wide settings are all set back to their defaults by clicking
<Clear All> or <Reset> in the user interface. Then
proceed to do job programming pertinent to your job.
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