Ricoh K-C3 Service Manual page 225

B245/B276/B277/B268/B269 Service Manual 18-Jan-06
of an edge, the machine applies the MTF filter for edges, using the value set in SP 4930. The
higher the setting, the sharper the image. However, this is only used when the customer uses
Text 1, Text 2, Photo 1-3, Special 1, Special 2, or Special 5.
The default value is "0" for each mode. However the actual strength of "0" differs from mode
to mode.
MTF Filter Adjustment - Solid
If the IPU detects that the dot is not part of an edge, the machine applies the MTF filter for
solid areas using the value set in SP 4931. The higher the setting, the sharper the image.
However, this is only used when the customer uses Text 2.
The default value is "0" for each mode. However the actual strength of "0" differs from mode
to mode.
MTF Filter Adjustment - Low ID Line
The IPU also checks the image density of all dots. If a succession of low-density dots is
detected, the machine interprets this as a low ID line and applies the MTF filter for low ID
lines, using the value set in SP 4932. The higher the setting, the sharper the image. However,
this is only used when the customer uses Text 1, Text 2, Photo 2, Special 1, Special 2, or
Special 5.
The default value is "0" for each mode. However, the actual strength of "0" differs from mode
to mode.
Independent Dot Erase
When the user selects Text 1 and 2, Photo 2, and Special 1, 2, and 5 modes, independent
dots are detected using a matrix and erased from the image. The detection level can be
adjusted with SP 4928.
The higher setting, the greater number of dots the machine will erase. The machine erases
the dots regardless of their image density. However, note that dots in mesh-like images may
be mistakenly detected as independent dots.
Line Width Correction
When the user selects Text 1 and 2, Photo 2, Special 1, 2, and 5, the thickness of lines is
adjusted using the setting of SP4-927. Note that the default for all modes except Special 2 is
OFF.
Line width correction is done by the IPU (SCRATCH) chip.
ID Gamma Correction
The machine automatically selects the most appropriate ID gamma correction based on the
selected original type and the operation panel ID setting.
In all modes, ID gamma correction can be adjusted with SP 4923.
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