Id Gamma (Γ) Correction - Ricoh K-C1 Service Manual

IMAGE PROCESSING 20 February, 2001
Smoothing Filter Adjustment
The machine will apply the smoothing filter when the user selects Special 3 or 4
(Dithering), using the value in SP4-925-001. Note that this SP is also used when
the machine applies the MTF Filter for Edges (see above). The higher the setting,
the sharper the image.
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 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.
The higher the setting, the thicker the line. However note that Special 2 starts with
a thickness value higher than normal line thickness, whereas the others begin at
normal line thickness. So even if Special 2 is set to –2, the lines will still come out
thicker than normal.
Line width correction is done by the IPU (KT-ONE) chip.
ID Gamma ( γ γ γ γ ) Correction
The machine automatically selects the most appropriate ID gamma correction
based on the selected original type and the operation panel ID setting
.
Except for Special 1 and 2, each original mode has its own ID gamma correction
type. Special 2 uses the same type as Text 1, and Special 1 uses the same type as
Text 2.
In all modes, ID gamma correction can be adjusted with SP4-923.
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