NAME¶
rletopnm - convert a Utah Raster Tools RLE image file into a PNM image file.
SYNOPSIS¶
rletopnm [
--alphaout={
alpha-filename,
-}]
[
--headerdump|
-h] [
--verbose|
-v]
[
--plain|
-p] [
rlefile|
-]
All options may be abbreviated to their minimum unique abbreviation and options
and arguments may be in any order.
DESCRIPTION¶
This program converts Utah Raster Toolkit RLE image files into PNM image files.
rletopnm handles four types of RLE files: Grayscale (8 bit data, no
color map), Pseudocolor (8 bit data with a color map), Truecolor (24 bit data
with color map), and Directcolor (24 bit data, no color map).
rletopnm
generates a PPM file for all these cases except for the Grayscale file, for
which
rletopnm generates a PGM file.
rlefile is the RLE input file. If it is absent or
-, the input
comes from Standard Input.
OPTIONS¶
- --alphaout=alpha-filename
- rletopnm creates a PGM (portable graymap) file
containing the alpha channel values in the input image. If the input image
doesn't contain an alpha channel, the alpha-filename file contains
all zero (transparent) alpha values. If you don't specify
--alphaout, rletopnm does not generate an alpha file, and if
the input image has an alpha channel, rletopnm simply discards it.
If you specify - as the filename, rletopnm writes the alpha
output to Standard Output and discards the image.
See pnmcomp(1) for one way to use the alpha output file.
- --verbose
- This option causes rletopnm to operate in verbose
mode. It prints messages about what it's doing, including the contents of
the RLE image header, to Standard Error.
- --headerdump
- This option causes rletopnm to operate in header
dump mode. It prints the contents of the RLE image header to Standard
Error, but does not produce any other output.
- --plain
- This option causes the PNM output file to be in the
"plain" (text) format, instead of the default "raw"
(binary) format. See ppm(5) and pgm(5) for details on the
difference.
EXAMPLES¶
- rletopnm --verbose lenna.rle >lenna.ppm
- While running in verbose mode, convert lenna.rle to PPM
format and store the resulting image as lenna.ppm.
- rletopnm --headerdump file.rle
- Dump the header information of the RLE file called
file.rle.
- rletopnm --alphaout=dartalpha.pgm dart.rle
>dart.ppm
- Convert RLE file dart.rle to PPM format as dart.ppm. Store
the alpha channel of dart.rle as dartalpha.pgm (if dart.rle doesn't have
an alpha channel, store a fully transparent alpha mask as dartalpha.pgm).
SEE ALSO¶
pnmtorle(1),
pnmconvol(1),
pnm(5),
ppm(5),
pgm(5),
urt(1),
RLE(5)
AUTHOR¶
Wes Barris
Army High Performance Computing Research Center (AHPCRC)
Minnesota Supercomputer Center, Inc.
Modifications by Eric Haines to support raw and plain formats.
Modifications by Bryan Henderson to create alpha files and use mnemonic
options.