Ricoh Gestetner 5450, Service Manual, Page: 36 / 315

IMAGE-PROCESSING 1 July, 1998
2-8
2.2.4 FILTERING AND MAIN SCAN MAGNIFICATION/REDUCTION
Overview
Filtering and main scan magnification process the image data after auto shading.
However, to reduce moire in the image, the processing order depends on the
reproduction ratio, as follows:
1) Reduction and Full size
Main Scan Reduction
→
Filtering
2) Enlargement
Filtering
→
Main Scan Magnification
Filtering
The MTF and smoothing filters are software filters that enhance the desired image
qualities of the selected original mode.
The MTF filter, used in all modes except Tint mode (which uses the smoothing
filter), sharpens the image.
SP6-082 adjusts the filter strengths for MTF mode.
The diagram below shows how the number stored in the SP mode afects the
strength of the filter.
NOTE: 1) Do not set the filter strength number to 1. Abnormal images may result.
2) The smoothing filter strength is not adjustable.
1 1 8 2
C229D505.WMF