Halftoning is always device specific. Halftoning always refers to ’Type3’ halftoning.
The following halftone cells are defined and optimized for the Océ VarioPrint 6000 Series.
|
Name |
Frequency / Grey level |
Intented for resolution |
Remarks |
|---|---|---|---|
|
/Halftone85lpi_4 |
85 lpi / 182 |
600 x 600 dpi |
|
|
/Halftone106lpi_4 |
106 lpi / 124 |
600 x 600 dpi |
Default for 600 dpi |
|
/Halftone106lpi_2 |
106 lpi / 124 |
600 x 1200 dpi |
|
|
/Halftone125lpi_4 |
125 lpi / 93 |
600 x 600 dpi |
|
|
/Halftone125lpi_2 |
125 lpi / 237 |
600 x 1200 dpi |
Default for 1200 dpi |
|
/Halftone141lpi_4 |
141 lpi / 227 |
600 x 1200 dpi |
|
|
/Halftone180lpi_2 |
180 lpi / 215 |
600 x 1200 dpi |
NOTE
The use of a 1200 dpi with a 600 dpi HWResolution may result in poor print quality. It is the responsibility of the creator of the PostScript file to use the appropriate dither matrices for each resolution.
Example
To switch to 125 lpi regardless of the current resolution:
% Overwrite 1200 dpi default halftone with the 125lpi
/DefaultBWHalftone1200
/Halftone125lpi_2 /Halftone findresource
/Halftone defineresource pop
% Overwrite 600 dpi default halftone with the 125lpi
/DefaultBWHalftone600
/Halftone125lpi_4 /Halftone findresource
/Halftone defineresource pop
% Activation is done by setpagedevice
<<>> setpagedevice
The parameter /HWResolution specifies the bitmap resolutions:
/HWResolution [600 600]
/HWResolution [600 1200]
Changing the /HWResolution pagedevice parameter changes the resolutions to which page contents will be rasterised.
The resolution is set on a per job basis and the PS defaults are used.
The default [600 600] cannot be changed by the job setting.
The default resolution is set in the Settings Editor in KOS.