Ricoh B079, Service Manual

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IMAGE PROCESSING
B079/B082 6-28 SM
6.5.8 PRE-FILTERING
SP mode settings 4903 10 ~ 15 select pre-filters by changing the filter coefficient
settings.
Original
Mode
SP No. Default Setting Mag. Smoothing
Text SP4903 10 0 0 25% ~ 400% OFF
Photo SP4903 12 0 1 25% ~ 50% Weak
Text/Photo SP4903 13 0 2 25% ~ 50% Medium
Pale SP4903 15 0 3 25% ~ 50% Strong
Generation SP4903 16 0 4 25% ~ 99% Weak
↓ 5 25% ~ 99% Medium
Range 0 ~ 9 6 25% ~ 99% Strong
7 25% ~ 400% Weak
8 25% ~ 400% Medium
9 25% ~ 400% Strong
Note : An SP code number and name set in bold italic denotes an SSP (Special Service Program)
mode. To access an SSP, enter the SP mode: press and hold down

on the 10-key pad then
“Copy SP” on the touch-screen.
These SP mode settings are provided to reduce the incidence of moiré in the
reproduction of images whose data signals have been compressed in the direction
of the main scan. However, these SP adjustments can cause different effects in the
reproduction of images depending on:
•
Whether they contain areas shaded with dot screening (newspaper,
magazine photos)
•
Their reduction ratios.
These adjustments can also cause blurring in the reproduction of images that
contain:
•
Low density dots
•
Low contrast text characters
•
Fine lines
While filter processing is provided to reduce the incidence of moiré generated from
digital signals, you must always pay attention to how these adjustments affect text
characters and fine lines.