− convert a Netpbm image file into an RLE image
[ −h ] [ −v ] [ −a ]
[ −o outfile ] [ pnmfile ]
converts Netpbm image files into Utah RLE(5) image
files. You can include an alpha mask. If the input is a
multiple image file, the output consists of several
concatenated RLE images.
The RLE file
will contain either a three channel color image (24 bits) or
a single channel grayscale image (8 bits) depending upon the
pnm file depth. If a converted ppm is displayed on an 8 bit
display, the image must be dithered. In order to produce a
better looking image (on 8 bit displays), it is recommended
that the image be quantizing (to 8 bit mapped color) prior
to its display. This may be done by piping the output of
this program into the Utah mcut(1) or
rlequant(1) utilities. An example of this is shown
This option will cause pnmtorle
to operate in verbose mode. The header information is
written to "stderr". Actually, there is not much
header information stored in a Netpbm file, so this
information is minimal.
This option allows the header of the Netpbm image to be
dumped to "stderr" without converting the file. It
is equivalent to using the −v option except that no
file conversion takes place.
This option causes pnmtorle to include an alpha channel
in the output image. The alpha channel is based on the
image: Wherever a pixel is black, the corresponding alpha
value is transparent. Everywhere else, the alpha value is
If specified, the output will
be written to this file. If outfile is
"−", or if it is not specified, the output
will be written to the standard output stream.
The name of the Netpbm image
data file to be converted. If not specified, standard input
−v file.ppm −o file.rle
While running in verbose mode,
convert file.ppm to RLE format and store resulting data in
pnmtorle −h file.pgm
Dump the header information of
the Netpbm file called file.pgm.
Army High Performance Computing Research Center (AHPCRC)
Minnesota Supercomputer Center, Inc.