Rletopnm User Manual

# rletopnm

Updated: 13 April 2000
Table Of Contents

## NAME

rletopnm - convert a Utah Raster Tools RLE image file to a PNM image file.

## SYNOPSIS

rletopnm [--alphaout={alpha-filename,-}] [--headerdump|-h] [--verbose|-v] [rlefile|-]

All options may be abbreviated to their minimum unique abbreviation and options and arguments may be in any order.

## DESCRIPTION

This program is part of Netpbm.

rletopnm converts Utah Raster Toolkit RLE image files to 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

In addition to the options common to all programs based on libnetpbm (most notably -quiet, see Common Options), rletopnm recognizes the following command line options:

--alphaout=alpha-filename
  rletopnm creates a PGM (portable graymap) file containing the transparency channel values in the input image. If the input image doesn't contain an transparency channel, the alpha-filename file contains all zero (transparent) transparency values. If you don't specify --alphaout, rletopnm does not generate a transparency file, and if the input image has a transparency channel, rletopnm simply discards it.

  If you specify - as the filename, rletopnm writes the transparency output to Standard Output and discards the image.

  See pamcomp for one way to use the transparency 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.

## EXAMPLES

- While running in verbose mode, convert lenna.rle to PPM format and store the resulting image as lenna.ppm:

          rletopnm --verbose lenna.rle >lenna.ppm

- Dump the header information of the RLE file called file.rle:

          rletopnm --headerdump file.rle

- Convert RLE file dart.rle to PPM format as dart.ppm. Store the transparency channel of dart.rle as dartalpha.pgm (if dart.rle doesn't have a transparency channel, store a fully transparent transparency mask as dartalpha.pgm):

          rletopnm --alphaout=dartalpha.pgm dart.rle >dart.ppm

## SEE ALSO

pnmtorle, pnmconvol, pnm, ppm, pgm,

## AUTHOR

Wes Barris
Army High Performance Computing Research Center (AHPCRC)
Minnesota Supercomputer Center, Inc.

Modifications by Eric Haines to produce raw and plain formats.

Modifications by Bryan Henderson to create transparency files and use mnemonic options.

## Table Of Contents

- SYNOPSIS
- DESCRIPTION
- OPTIONS
- EXAMPLES
- SEE ALSO
- AUTHOR