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.
-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 specified, the output will be written to this file. If out-
file is "-", or if it is not specified, the output will be writ-
ten to the standard output stream.
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.
rletopnm(1), urt(1), RLE(5).
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