HP QMS 1660E manual 60

Emulations

Gamma Correction

This option enables or disables gamma correction for PostScript files. For more information, see chapter 5, “Advanced Technical Informa- tion,” in the Reference.

Menu	Administration/Emulations/PostScript/Gamma Correction
Choices	No—Disables gamma correction
	Yes—Enables gamma correction, which adjusts the range of
	gray levels to give you the best possible image. Gamma
	correction sharpens overall mid-range contrast while blacks
	(shadows) and white (highlights) keep their original values.
	You can use this option to correct gray-scale problems or to
	accentuate detail for scanned images.
Default	No
Notes	Gamma correction is automatically adjusted when printer
	resolution is changed. However, gamma correction has no
	effect on files printed at 1200x1200 dpi resolution. In addition,
	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 and the PostScript Language Reference
	Manual for more information.)

Halftone Type

This option allows you to specify the halftone used to print PostScript files. For more information, see chapter 5, “Advanced Technical Infor- mation,” in the Reference.

Menu Administration/Emulations/PostScript/Halftone Type

Choices Basic—Regular dot placement at 53 lpi for 30 0x300 resolution or 71 dpi for 600x600 resolution.

Advanced—Var iable dot placement according to the grayscale within the image. Generally, this option provides smoother transitions between grayscales within the image.

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