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Rletopnm User Manual
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RLETOPNM
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Updated: 13 April 2000
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Table Of Contents
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NAME
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rletopnm - convert a Utah Raster Tools RLE image file to a PNM image file.
.SH 2
SYNOPSIS
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\fBrletopnm\fR
[\fB--alphaout=\fR{\fIalpha-filename\fR,\fB-\fR}]
[\fB--headerdump\fR|\fB-h\fR]
[\fB--verbose\fR|\fB-v\fR]
[\fIrlefile\fR|\fB-\fR]
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All options may be abbreviated to their minimum unique abbreviation
and options and arguments may be in any order.
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DESCRIPTION
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This program is part of Netpbm.
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\fBrletopnm\fR converts Utah Raster Toolkit RLE image files to PNM
image files.  \fBrletopnm\fR 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).  \fBrletopnm\fR generates a PPM file for
all these cases except for the Grayscale file, for which
\fBrletopnm\fR generates a PGM file.
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\fIrlefile\fR is the RLE input file.  If it is absent or \fB-\fR,
the input comes from Standard Input.
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OPTIONS
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.RS
.IP "\fB--alphaout=\fR\fIalpha-filename\fR"
\fBrletopnm \fR 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 \fIalpha-filename\fR file contains all
zero (transparent) alpha values.  If you don't specify
\fB--alphaout\fR, \fBrletopnm\fR does not generate an alpha file,
and if the input image has an alpha channel, \fBrletopnm\fR simply
discards it.
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If you specify \fB-\fR as the filename, \fBrletopnm\fR writes the
alpha output to Standard Output and discards the image.
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See \fBpamcomp\fR for one way to use
the alpha output file.
.IP "\fB--verbose\fR"
This option causes \fBrletopnm \fR to operate in verbose mode.
It prints messages about what it's doing, including the contents of
the RLE image header, to Standard Error.
.IP "\fB--headerdump\fR"
This option causes \fBrletopnm\fR 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.
.RE
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EXAMPLES
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.IP \(bu
While running in verbose mode, convert lenna.rle to PPM format and
store the resulting image as lenna.ppm:
.DS L
\f(CW    rletopnm --verbose lenna.rle >lenna.ppm
\fR.DE
.IP \(bu
Dump the header information of the RLE file called file.rle:
.DS L
\f(CW    rletopnm --headerdump file.rle
\fR.DE
.IP \(bu
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):
.DS L
\f(CW    rletopnm --alphaout=dartalpha.pgm dart.rle >dart.ppm
\fR.DE
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.SH 2
SEE ALSO
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\fBpnmtorle\fR,
\fBpnmconvol\fR,
\fBpnm\fR,
\fBppm\fR,
\fBpgm\fR,
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AUTHOR
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Wes Barris
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Army High Performance Computing Research Center (AHPCRC)
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Minnesota Supercomputer Center, Inc.
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Modifications by Eric Haines to support raw and plain formats.
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Modifications by Bryan Henderson to create alpha files and use
mnemonic options.
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\l'5i'
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Table Of Contents
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.IP \(bu
SYNOPSIS
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DESCRIPTION
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OPTIONS
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EXAMPLES
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SEE ALSO
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AUTHOR
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