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pnmtops General Commands Manual pnmtops

NAME

pnmtops – convert portable anymap to PostScript

SYNOPSIS

pnmtops [-scale s] [-dpi n] [-imagewidth n] [-imageheight n] [-width=N] [-height=N] [-equalpixels] [-turn|-noturn] [-rle|-runlength] [-nocen‐
ter] [-setpage] [-nosetpage] [pnmfile]

All options can be abbreviated to their shortest unique prefix. You
may use two hyphens instead of one. You may separate an option name
and its value with white space instead of an equals sign.

DESCRIPTION

Reads a Netpbm image as input. Produces Encapsulated PostScript as
output.

If the input file is in color (PPM), pnmtops generates a color Post‐
Script file. Some PostScript interpreters can’t handle color Post‐
Script. If you have one of these you will need to run your image
through ppmtopgm first.

If you specify no output dimensioning options, the output image is
dimensioned as if you had specified -scale=1.0, which means aproxi‐
mately 72 pixels of the input image generate one inch of output (if
that fits the page).

Use -imagewidth, -imageheight, -equalpixels, -width, -height, and
-scale to adjust that.

OPTIONS

-imagewidth
-imageheight Tells how wide and high you want the image on the
page, in inches. The aspect ratio of the image is preserved, so
if you specify both of these, the image on the page will be the
largest image that will fit within the box of those dimensions.

If these dimensions are greater than the page size, you get
Postscript output that runs off the page.

You cannot use imagewidth or imageheight with -scale or
-equalpixels.

-equalpixels
This option causes the output image to have the same number of
pixels as the input image. So if the output device is 600 dpi
and your image is 3000 pixels wide, the output image would be 5
inches wide.

You cannot use -equalpixels with -imagewidth, -imageheight, or
-scale.

-scale tells how big you want the image on the page. The value is the
number of inches of output image that you want 72 pixels of the
input to generate.

But pnmtops rounds the number to something that is an integral
number of output device pixels. E.g. if the output device is
300 dpi and you specify -scale=1.0, then 75 (not 72) pixels of
input becomes one inch of output (4 output pixels for each input
pixel). Note that the -dpi option tell pnmtops how many pixels
per inch the output device generates.

If the size so specified does not fit on the page (as measured
either by the -width and -height options or the default page
size of 8.5 inches by 11 inches), pnmtops ignores the -scale
option, issues a warning, and scales the image to fit on the
page.

-dpi This option specifies the dots per inch of your output device.
The default is 300 dpi. In theory PostScript is device-indepen‐
dent and you don’t have to worry about this, but in practice its
raster rendering can have unsightly bands if the device pixels
and the image pixels aren’t in sync.

Also this option is crucial to the working of the equalpixels
option.

-width
-height These options specify the dimensions of the page on
which the output is to be printed. This can affect the size of
the output image.

The page size has no effect, however, when you specify the
-imagewidth, -imageheight, or -equalpixels options.

These options may also affect positioning of the image on the
page and even the paper selected (or cut) by the printer/plotter
when the output is printed. See the -nosetpage option.

The default is 8.5 inches by 11 inches.

-turn -noturn These options control whether the image gets turned 90
degrees. Normally, if an image fits the page better when turned
(e.g. the image is wider than it is tall, but the page is taller
than it is wide), it gets turned automatically to better fit the
page. If you specify the -turn option, pnmtops turns the image
no matter what its shape; If you specify -noturn, pnmtops does
not turn it no matter what its shape.

-rle -runlength These identical options specify run-length compres‐
sion. This may save time if the host-to-printer link is slow;
but normally the printer’s processing time dominates, so -rle
makes things slower.

-nocenter
By default, pnmtops centers the image on the output page. You
can cause pnmtops to instead put the image against the upper
left corner of the page with the -nocenter option. This is use‐
ful for programs which can include PostScript files, but can’t
cope with pictures which are not positioned in the upper left
corner.

For backward compatibility, pnmtops accepts the option -center,
but it has no effect.

-setpage
pnmtops can generate a “setpagedevice” directive to tell the
printer/plotter what size paper to use (or cut). The dimensions
it specifies on this directive are those selected or defaulted
by the width and height options or defaulted. If you want a
“setpagedevice” directive in the output, specify -setpage. This
can be useful if your printer chokes on this directive, which
has not always been defined in Postscript, or you want to fake
out the printer and print on one size paper as if you’re print‐
ing on another.

Before release 10.0 the default was to generate the “setpagede‐
vice” directive, and there is the switch -nosetpage to supress
it, but that’s actually a no-op now.

SEE ALSO

pnm(5), gs, psidtopgm, pstopnm, pbmtolps, pbmtoepsi,
pbmtopsg3, ppmtopgm,

AUTHOR

Copyright (C) 1989, 1991 by Jef Poskanzer.
Modified November 1993 by Wolfgang Stuerzlinger, wrzl@gup.uni-
linz.ac.at

25 May 2001 pnmtops

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