HP QMS 1660 - Manual (Page 60)

Hard Disks
QMS 1660 Print System Reference 4-28
Halftone Type
This option allows you to specify the halftone used to print PostScript
files. For more information, see chapter 5, “Additional Technical Infor-
mation,” in the
Reference.
Hard Disks
Use the Administration/Disk Operations menu to perform disk opera-
tion processes that appear only when optional hard disks are
installed.
Default No
Notes Gamma correction is automatically adjusted when printer
resolution is changed, and it 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.)
Menu Administration/Emulations/PostScript/Halftone Type
Choices Basic—Regular dot placement at 53 lpi for 300x300 resolution
or 71 dpi for 600x600 resolution.
Advanced—Variable dot placement according to the grayscale
within the image. Generally, this option provides smoother
transitions between grayscales within the image.
Default Advanced
Notes When the advanced halftone type is chosen, gamma
correction (Administration/Emulations/PostScript/Gamma
Correction menu) has no effect on the image.