Using Gamma
Correction
QMS 1725 SLS Print System User's Guide
4-6
Gamma Correction Concept
Often in scanned images, gray scaling may be too light or dark to
show details clearly. Using gamma correction on a gray-scale image
is similar to using a graphic equalizer on a home stereo; the range of
gray levels is adjusted for the best possible image. This sharpens
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
printers 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
Administration/Engine/Gamma Correction
Choices
0, 1, 2, 3
Default
0
Notes
0 the gamma correction is turned off.
1gamma correction provides a low contrast.
2gamma correction provides medium contrast
3gamma correction provides a high contrast
Gamma correction applies only to PostScript images.
If turning on gamma correction doesnt 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 and the PostScript Language Reference
Manual for more information.)
Summary of Contents for 1725 SLS
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Page 15: ...Contents xi F Configuration Menu Menu Diagrams F 2 Glossary Index v...
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Page 233: ...A QMS Customer Support In This Chapter n Sources of customer support n QMS world wide offices...
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Page 275: ...D Sessions In This Chapter n Sessions commands...
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Page 293: ...F Configuration Menu In This Chapter n Menu Diagrams...
Page 296: ...Menu Diagrams QMS 1725 SLS Print System User s Guide F 4 v...
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