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HP Designjet 50ps Printer - LPI, PPI, and DPI Matrix for Remote Proofing

Type of job
LPI (Imagesetter resolution)
PPI* (scanning resolution)
DPI (Inkjet printer resolution)
50PS print mode
Drafts
< 60lpi
100 ppi
300 dpi
Draft
Newsletters and grocery coupons
65 lpi
130 ppi
600 dpi
Normal
Newspapers (uncoated paper)
85 lpi
170 ppi
900 dpi
Best
Color Magazine
133lpi
266 ppi
1800 dpi
Premium
Fine Art and Photo Images
175 to 200 lpi
400 ppi
2400 dpi
Premium
* PPI - Scanned images must be scanned at least at these levels.
LPI - Lines per inch
PPI - Pixels per inch
DPI - Dots per inch

Additional information defining the minimum resolution for images used in the job

If low-resolution image data is used when layouts are created in order to reduce the data volume and to speed up processing, this data should naturally be replaced by the corresponding high-resolution image data before final output, for example at an imagesetter.
In practice, it is frequently found in the case of OPI workflows that this data substitution is not performed because, for example, the high-resolution data have been moved to a different location in the file system. This will not be detected until the final results showing a poor quality are available.
The image resolution check allows you to set up a control mechanism to catch such "errors" already during output.
Figure : Resolution check
In the bottom section, you specify the minimum resolution for the images used in the print job. This can be specified in dpi (dots per inch) or l/cm (lines per centimeter).
You can select whether:
  • No image resolution check is to be performed (= function disabled),
  • To have a warning displayed if the resolution falls below the minimum resolution specified (the job is printed nevertheless),
  • Or to have the print job cancelled automatically when the actual resolution is lower than the minimum resolution.
Tip: The specified minimum resolution should correspond to your usual working habits or the image material used. For example, if you frequently output print jobs that contain screen shots in normal screen resolution, then a setting of 300 dpi will hinder operations. If you want to avoid outputting low-resolution images with incorrect OPI, then a minimum resolution value just above the resolution of the low-res data is suitable (e.g. 100 dpi).
If you enter a value higher than 300 dpi (= 118.1 l/cm) for the minimum resolution, then a warning message is displayed in order to avoid incorrect input caused by mistyping.

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