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This program is part of Netpbm.
pbmtolps reads a PBM image as input and outputs PostScript. The output Postscript uses lines instead of the image operator to generate a (device dependent) picture which will be imaged much faster.
pnmtops is a more general program for converting from the Netpbm formats to Postscript, though it cannot produce the particular arcane subformat that pbmtolps does.
One pixel of the input image corresponds to one printed pixel ("dot"). For this to work, you must use a -dpi option to tell pmtolps the resolution of the target printer, in dots per inch.
The Postscript program pbmtolps generates draws paths of less than 1000 segments so as not to overrun limits on the Apple Laserwriter and possibly other printers.
In addition to the options common to all programs based on libnetpbm (most notably -quiet, see Common Options), pbmtolps recognizes the following command line option: