IBM 1725 SLS - Manual (Page 129)

Using Gamma
Correction
4-3 Print Quality
1 Open the printer top cover.
2 Locate the density adjustment dial that is inside the printer
on the left side.
The scale on the density adjustment dial shows the density set-
ting; the dark marking identifies increased density, and the light
marking identifies reduced density.
3 Adjust the dial to the desired setting.
To increase density (darken print on the page), slide the dial
toward the rear of the printer. To decrease density (lighten print
on the page), slide the dial toward the front of the printer. The dial
clicks at the center setting.
» Note: You may want to increase density as the toner cartridge
depletes.
Using Gamma Correction
Gamma correction is an adjustment of the ranges of shading in a
printed image to provide the best copy of scanned images. Through
manipulation of shading levels, your printer can be set to improve the
print quality of a scanned image automatically.
The main benefit of gamma correction is that it improves the print
quality of a scanned image by improving contrasts at a given resolu-