Setting the Dither Pattern
Dithering is a technique for reproducing color and density using groups of small dots. The source data for drawing these dots is called a dither pattern. Using a dither pattern suitable for the image to print enables the gradations and curves of the printed image to be reproduced more smoothly.
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Press 
(Settings/Registration) 
<Adjustment/Maintenance> <Adjust Image Quality> <Dither Pattern Settings>.
(Settings/Registration) <Adjustment/Maintenance> <Adjust Image Quality> <Dither Pattern Settings>.2
Select the dither pattern.
<Pattern 1>: This setting enhances the reproduction of halftones of color images.
<Pattern 2>: The default setting.
<Pattern 3>: This setting enhances reproduction of highlight areas of color images.
<Pattern 4>: This setting improves the granularity of color images.
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Press <OK>.
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Press <Yes>, and perform auto gradation adjustment (full adjustment).
Since this may cause poor color balance, make sure to perform auto gradation adjustment (full adjustment) after changing the settings. Adjusting Gradation Automatically