pnmtorle - convert a Netpbm image file into an RLE image file.
pnmtorle [ __-h__? [ __-v__? [ __-a__? __-o__ ''outfile''? [ ''pnmfile''?
This program 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 later.
This option will cause pnmtorle to operate in verbose mode.
The header information is written to
This option allows the header of the Netpbm image to be
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 fully
If specified, the output will be written to this file. If
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
Army High Performance Computing Research Center (AHPCRC)
Minnesota Supercomputer Center, Inc.