Ricoh B121 Service Manual page 284

IMAGE PROCESSING
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 SP4-928.
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.
γ
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 SP4-923.
B121/B122/B123 6-26 SM