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ppmtoxpm(1) General Commands Manual ppmtoxpm(1)
NAME
ppmtoxpm - convert a portable pixmap into an X11 pixmap
SYNOPSIS
ppmtoxpm [-name=xpmname] [-rgb=rgb-textfile] [-alphamask=pgmfile] [ppmfile]
Minimum unique abbrevations are acceptable.
DESCRIPTION
Reads a portable pixmap as input. Produces X11 pixmap (version 3) as output which can be
loaded directly by the XPM library.
For example, to convert the file "dot" (found in /usr/include/X11/bitmaps), from xbm to
xpm one could specify
xbmtopbm dot | ppmtoxpm -name dot
or, with a rgb text file (in the local directory)
xbmtopbm dot | ppmtoxpm -name dot -rgb rgb.txt
OPTIONS
-name=xpmname
The -name option allows you to specify the prefix string which is printed in the
resulting XPM output. If not specified, will default to the filename (without ex-
tension) of the <ppmfile> argument. If you do not specify -name or ppmfile, (i.e.
your input is from Standad Input), the prefix string defaults to the string noname.
rgb=rgb-textfile
The -rgb option allows you to specify an X11 rgb text file for the lookup of color
name mnemonics. This rgb text file is typically the /usr/lib/X11/rgb.txt of the
MIT X11 distribution, but any file using the same format may be used. When speci-
fied and a RGB value from the ppm input matches a RGB value from the <rgb-
textfile>, then the corresponding color name mnemonic is printed in the XPM's col-
ormap. If you don't specify -rgb or if the RGB values don't match, then ppmtoxpm
produces the color specifications in the #RGB, #RRGGBB, #RRRGGGBBB, or #RRRRGGGG-
BBBB hexadecimal format.
-alphamask=pgmfile
This option names a PGM file to use as an alpha (transparency) mask. The file must
contain an image the same dimensions as the input image. ppmtoxpm marks as trans-
parent any pixel whose position in the alpha mask image is at most half white.
If you don't specify -alphamask, ppmtoxpm makes all pixels in the output opaque.
ppmcolormask is one way to generate an alpha mask file. You might also generate it
by extracting transparency information from an XPM file with the -alphaout option
to xpmtoppm. There are similar options on other Netpbm converters that convert
from formats that include transparency information too.
LIMITATIONS
An option to match the closest (rather than exact) color name mnemonic from the rgb text
would be a desirable enhancement.
Truncation of the least significant bits of a RGB value may result in nonexact matches
when performing color name mnemonic lookups.
SEE ALSO
ppmcolormask(1), xpmtoppm(1), ppm(5)
XPM Manual by Arnaud Le Hors lehors AT mirsa.fr
AUTHOR
Copyright (C) 1990 by Mark W. Snitily.
Permission to use, copy, modify, and distribute this software and its documentation for
any purpose and without fee is hereby granted, provided that the above copyright notice
appear in all copies and that both that copyright notice and this permission notice appear
in supporting documentation. This software is provided "as is" without express or implied
warranty.
This tool was developed for Schlumberger Technologies, ATE Division, and with their per-
mission is being made available to the public with the above copyright notice and permis-
sion notice.
Upgraded to XPM2 by
Paul Breslaw, Mecasoft SA, Zurich, Switzerland (paul AT mecazh.ch)
Thu Nov 8 16:01:17 1990
Upgraded to XPM version 3 by
Arnaud Le Hors (lehors AT mirsa.fr)
Tue Apr 9 1991
Tue Apr 9 1991 ppmtoxpm(1)
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