Pnmtorle User Manual(0) Pnmtorle User Manual(0)
pnmtorle - convert a Netpbm image file into an RLE image file.
[-h] [-v] [-a] [-o outfile] [pnmfile]
This program is part of Netpbm(1).
This program converts Netpbm image files into Utah RLE 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 or rlequant utilities. We
show an example of this later.
-v 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.
-h 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.
-a This option causes pnmtorle to include an alpha channel in the
output image. The alpha channel is based on the image: Wher-
ever a pixel is black, the corresponding alpha value is trans-
parent. Everywhere else, the alpha value is fully opaque.
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.
netpbm documentation March 31, 1994 Pnmtorle User Manual(0)
Man(1) output converted with