rasttopnm
Convert Sun raster images to PNM format
TLDR
Convert a Sun raster file to PNM on stdout
$ rasttopnm [input.ras] > [output.pnm]
Read from stdin and write PNM on stdout$ cat [input.ras] | rasttopnm > [output.pnm]
Output the index plane of a colormapped raster (debugging)$ rasttopnm -index [input.ras] > [output.pgm]
Convert and pipe to PNG$ rasttopnm [input.ras] | pnmtopng > [output.png]
SYNOPSIS
rasttopnm [-index] [rastfile]
DESCRIPTION
rasttopnm converts Sun Rasterfile images (.ras) to Portable Anymap (PNM) format, automatically selecting PBM, PGM, or PPM output based on the input image's color depth and colormap. Sun Rasterfile was the native image format on SunOS and Solaris systems and is commonly produced by older X11 tools.Output goes to standard output. Part of the Netpbm toolkit.
PARAMETERS
rastfile
Sun Rasterfile (.ras) input. Reads from stdin if omitted.-index
For colormapped rasters, output the raw color-index plane as PGM instead of dereferencing it through the colormap to produce PPM. Mainly useful for inspecting the underlying data.
INSTALL
sudo apt install netpbm
sudo dnf install netpbm
sudo pacman -S netpbm
sudo apk add netpbm
sudo zypper install netpbm
brew install netpbm
nix profile install nixpkgs#netpbm
CAVEATS
Some less-common Rasterfile encodings (e.g. RTBYTEENCODED RLE with unusual colormaps) may not be supported on every Netpbm build. The converter chooses the narrowest PNM subtype that can losslessly represent the input.
