1Sgitopnm User Manual(0)                                Sgitopnm User Manual(0)
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NAME

6       sgitopnm - convert a SGI image file to PNM
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SYNOPSIS

10       sgitopnm
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12       [-verbose]
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14       [-channel c]
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16       [SgiFileName]
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DESCRIPTION

21       This program is part of Netpbm(1).
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23       sgitopnm  reads an SGI image file as input and produces a PGM image for
24       a 2-dimensional (1- or 2-channel) input file, and a  PPM  image  for  a
25       3-dimensional (3 or more channels) input file.
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27       Alternatively, the program produces a PGM image of any one of the chan‐
28       nels in the input file.
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30       Before Netpbm 10.67 (June 2014), sgitopnm does not  work  on  2-channel
31       SGI images.  It fails if you try.
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33       If  you  don't specify the SgiFileName argument, input is from Standard
34       Input.
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36       Before Netpbm 10.67 (June 2014), sgitopnm requires its input  to  be  a
37       seekable file, so for example you can't feed it from a pipe.
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OPTIONS

42       In  addition  to  the options common to all programs based on libnetpbm
43       (most notably -quiet, see
44        Common Options ⟨index.html#commonoptions⟩ ), sgitopnm  recognizes  the
45       following command line options:
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49       -verbose
50              Give some information about the SGI image file.
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53       -channel n
54              Extract channel n of the image as a PGM image.
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56              Without this option, sgitopnm extracts the first 3 channels as a
57              PPM image or, if the input has 1 or  2  channels,  extracts  the
58              first channel as a PGM image.
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60              A 2-channel image is grayscale plus transparency, so you can get
61              the transparency information with -channel=2.   You  could  then
62              combine them into a PAM image of tuple type GRAYSCALE_ALPHA with
63              pamstack.
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REFERENCES

69       The   SGI   image   format   specification   version    1.0    is    at
70       ftp://ftp.sgi.com/graphics/grafica/sgiimage.html .
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72       There  is  an example SGI file at https://github.com/ZaaLabs/ZaaIL-Tes‐
73       tImages/tree/master/SGI .
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SEE ALSO

78       pnm(1), pam(1), pnmtosgi(1), pamstack(1)
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AUTHOR

83       Copyright (C) 1994 by Ingo Wilken  (  Ingo.Wilken@informatik.uni-olden‐
84       burg.de)
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DOCUMENT SOURCE

87       This  manual  page was generated by the Netpbm tool 'makeman' from HTML
88       source.  The master documentation is at
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90              http://netpbm.sourceforge.net/doc/sgitopnm.html
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92netpbm documentation             25 April 2014         Sgitopnm User Manual(0)
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