Updated: March 31, 1994
Table Of Contents
pnmtorle - convert a Netpbm image file into an RLE image file.
This program is part of Netpbm.
This program converts Netpbm image files into Utah RLE image files.
You can include a transparency 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 or
rlequant utilities. We show an example of this later.
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 transparency channel in the
output image. The transparency channel is based on the image: Wherever a
pixel is black, the corresponding trasparency value is transparent.
Everywhere else, the transparency value is fully opaque.
- -o outfile
- If you specify this option, pnmtorle writes the output to
this file. If outfile is - or you don't specify
-o, pnmtorle writes the output to Standard Output.
The name of the Netpbm image data file to be converted. If not specified,
standard input is assumed.
pnmtorle -v file.ppm -o file.rle
While running in verbose mode, convert file.ppm to RLE format and store
resulting data in file.rle.
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.
Table Of Contents