Ricoh B230 Training Program page 74

After ACC, you can adjust the gamma curve for
each color with SP 4909 to SP 4918. The
following four modes are available
•
ID Max, Shadow (high ID), Middle (middle ID),
Highlight (low ID).
A gamma curve describes the relation between the image density of the original
and that of the copy. The relationship is not linear: doubling the ID of an original
does not double the ID of the copy.
The printer characteristics are much more variable than the scanner. Therefore,
the printer gamma needs recalibration and adjustment from time to time. This is
done using the ACC procedure.
Each color has separate gamma curves for photo mode and letter mode, and for
copier mode and printer mode.
The gamma curves for C, M, Y, and Bk toner should be identical, but they are not.
ACC (Auto color Calibration) can be used to correct for this if copy quality is
drifting too far. This is done by the customer.
If this does not work, you can do the printer gamma adjustment.
Printer Gamma Correction
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