sgitopnm - convert a SGI image file to PNM - man(1) - [phpMan]

Che Dong

Convert an SGI file to a PNM file.

Convert an SGI image to a PNM file
sgitopnm {{path/to/input.sgi}} > {{path/to/output.pnm}}
Display information about the SGI file
sgitopnm {{-verb|-verbose}} {{path/to/input.sgi}} > {{path/to/output.pnm}}
Extract channel n of the SGI file
sgitopnm {{-c|-channel}} {{n}} {{path/to/input.sgi}} > {{path/to/output.pnm}}

Sgitopnm User Manual(1)                General Commands Manual               Sgitopnm User Manual(1)

NAME
       sgitopnm - convert a SGI image file to PNM


SYNOPSIS
       sgitopnm

       [-verbose]

       [-channel c]

       [SgiFileName]



DESCRIPTION
       This program is part of Netpbm(1).

       sgitopnm reads an SGI image file as input and produces a PGM image for a 2-dimensional (1- or
       2-channel) input file, and a PPM image for a 3-dimensional (3 or more channels) input file.

       Alternatively, the program produces a PGM image of any one of the channels in the input file.

       Before Netpbm 10.67 (June 2014), sgitopnm does not work on 2-channel SGI images.  It fails if
       you try.

       If you don't specify the SgiFileName argument, input is from Standard Input.

       Before  Netpbm  10.67  (June 2014), sgitopnm requires its input to be a seekable file, so for
       example you can't feed it from a pipe.



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



       -verbose
              Give some information about the SGI image file.


       -channel n
              Extract channel n 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 1 or 2 channels, extracts the first channel as a PGM image.

              A 2-channel image is grayscale plus transparency, so you can get the transparency  in‐
              formation with -channel=2.  You could then combine them into a PAM image of tuple type
              GRAYSCALE_ALPHA with pamstack.




REFERENCES
       The  SGI image format specification version 1.0 is at ftp://ftp.sgi.com/graphics/grafica/sgi‐
       image.html .

       There is an example SGI file at https://github.com/ZaaLabs/ZaaIL-TestImages/tree/master/SGI .



SEE ALSO
       pnm(1), pam(1), pnmtosgi(1), pamstack(1)



AUTHOR
       Copyright (C) 1994 by Ingo Wilken ( Ingo.Wilken AT informatik.de)

DOCUMENT SOURCE
       This manual page was generated by the Netpbm tool 'makeman' from  HTML  source.   The  master
       documentation is at

              http://netpbm.sourceforge.net/doc/sgitopnm.html

netpbm documentation                        25 April 2014                    Sgitopnm User Manual(1)

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