This is the command sgitopnm that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
sgitopnm - convert a SGI image file to a portable anymap
SYNOPSIS
sgitopnm [-verbose] [-channel c] [SGIfile]
DESCRIPTION
Reads an SGI image file as input. Produces a PGM image for a 2-dimensional (1 channel)
input file, and a PPM image for a 3-dimensional (3 or more channels) input file.
Alternatively, produces a PGM image of any one of the channels in the input file.
OPTIONS
-verbose
Give some information about the SGI image file.
-channel c
Extract channel c of the image as a PGM image. Without this option, sgitopnm
extracts the first 3 channels as a PPM image or, if the input has only 1 channel,
extracts that as a PGM image, and if the input has 2 channels, fails.
REFERENCES
SGI Image File Format documentation (draft v0.95) by Paul Haeberli (paul@sgi.com).
Available via ftp at sgi.com:graphics/SGIIMAGESPEC.
Use sgitopnm online using onworks.net services