PGMTORLE(1)PGMTORLE(1)NAMEpgmtorle - convert a pbmplus/pgm image file into an RLE image file.
SYNOPSISpgmtorle [ -h ] [ -v ] [ -a ] [ -o outfile ] [ filename ]
DESCRIPTION
This program converts PBMPLUS grayscale (pgm) image files into Utah
RLE(5) image files. PBMPLUS/pgm image files contain the image dimen‐
sions and 8-bit pixels with no matte or alpha data. When converting to
an RLE file, the alpha channel may optionally be computed. The RLE
file will contain a "grayscale" image (8 bits) with no colormap. The
origins of PBMPLUS and Utah RLE files are in the upper left and lower
left corners respectively, so this program automatically "flips" the
image. These RLE files may then be viewed using any RLE image viewer.
OPTIONS-v This option will cause pgmtorle to operate in verbose mode. The
header information is written to "stderr". Actually, there is
not much header information stored in a PBMPLUS file so this
information is minimal.
-h This option allows the header of the PBMPLUS 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 will cause pgmtorle to use the grayscale data to
compute an alpha channel in the resulting RLE file. For any
non-zero grayscale data, the alpha channel will contain a value
of 255. The resulting RLE image file will contain one color
channel and one alpha channel.
-o outfile
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.
infile.pgm
The name of the PBMPLUS image data file to be converted. This
file must end in ".pgm". However, it is not necessary to supply
the ".pgm" extension as it will be added to the supplied name if
not already there.
EXAMPLESpgmtorle-v test.pgm -o test.rle
While running in verbose mode, convert test.pgm to RLE format
and store resulting data in test.rle.
pgmtorle-h test
Dump the header information of the PBMPLUS file called test.pgm.
SEE ALSOppmtorle(1), rletoppm(1), urt(1), RLE(5).
AUTHOR
Wesley C. Barris
Army High Performance Computing Research Center (AHPCRC)
Minnesota Supercomputer Center, Inc.
1 July 20, 1990 PGMTORLE(1)
