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 extension) 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 specified
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 colormap. 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
#RRRRGGGGBBBB 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 transparent 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@mirsa.inria.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 permission is being made available to the public with
the above copyright notice and permission notice.
Upgraded to XPM2 by
Paul Breslaw, Mecasoft SA, Zurich, Switzerland (paul@mecazh.uu.ch)
Thu Nov 8 16:01:17 1990
Upgraded to XPM version 3 by
Arnaud Le Hors (lehors@mirsa.inria.fr)
Tue Apr 9 1991
Tue Apr 9 1991 ppmtoxpm(1)