QMS 1725E Reference page 106

overall midrange contrast while blacks (shadows) and whites (high-
lights) keep their original values. Gamma correction sets grayscale
values specified through the PostScript setgray operator to your
printer's gray-scale values.
Gamma correction is linked to print resolution. The main benefit of
gamma correction is that it improves the print quality of a scanned
image by improving halftones at a given resolution. To get the best
gray-scale PostScript image at any resolution, gamma correction
should be turned on.
You can set gamma correction through PS Exec or through the
Administration/Engine/Gamma Correction menu.
Menu
Choices
Default
Notes
5-6
Administration/Engine/Gamma Correction
On, Off
Off
When gamma correction is set to "on," the gamma correction is
automatically adjusted when printer resolution is changed.
Gamma correction applies only to PostScript images.
If turning on gamma correction doesn't yield a suitable gray-
scale image for your needs, set a specific gamma correction
value through your drawing application or through the
PostScript settransfer operator. (See your drawing application
documentation, the QMS Crown Technical Reference Manual ,
and the PostScript Language Reference Manual for more
information.)
QMS 1725E Print System Reference