Ricoh A66 Service Manual page 122

(4) YMCK Smoothing
The YMCK filter smooths the image data in photo areas only to give a softer
image.
(5) Edge Emphasis Filter (High Contrast Filter)
The high contrast filter improves text and graphic elements in letter mode
areas by making the edges in the copy stand out more clearly.
By changing the effect of the RGB smoothing filter, the YMCK smoothing
filter, and the high contrast filter, the image can be made sharper or softer.
The user can adjust this over 5 levels from the image adjustment screen.
SM 2-53
IMAGE PROCESSING
Before
After
Before
After
A166/A187/A189