QMS 860 Guide de l'utilisateur télécharger pdf (Page 192)

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101

NOTE: These gamma correction charts were not generated by the

Administration / Special Pages / Gamma Correction

selection. They are simulated output.

You can test gamma correction using the setgray PostScript

operator. The QMS Crown Technical Reference Manual, which is

an optional purchase available from your QMS vendor, contains

information on setgray.

NOTE: You may want to use the settransfer PostScript operator

to set gamma correction values not predefined in the

printer. (See the QMS Crown Technical Reference

Manual, which is an optional purchase available from

you QMS vendor, for more information on settransfer.)

Gamma Correction Application

You can use gamma correction to correct gray-scale problems for

scanned images or to accentuate detail. An increase in the gamma

value lightens the image. This change does not affect black or white

text, but may affect gray text. Here are some examples:

■ For a photo with a wide range of gray areas from white to

black, you might want to use gamma correction 1.

■ For a photo with very dark or very light areas and few

intermediate gray areas, you might want to use gamma

correction 3.

The main benefit of gamma correction is that it improves the copy

quality of a scanned image.

♦

Chapter 6

Print Quality 6-7

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QMS 860 Guide de l'utilisateur Page 192

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