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+.\" This man page was generated by the Netpbm tool 'makeman' from HTML source.
+.\" Do not hand-hack it!  If you have bug fixes or improvements, please find
+.\" the corresponding HTML page on the Netpbm website, generate a patch
+.\" against that, and send it to the Netpbm maintainer.
+.TH "Sgitopnm User Manual" 0 "25 April 2014" "netpbm documentation"
+
+.SH NAME
+
+sgitopnm - convert a SGI image file to PNM
+
+.UN synopsis
+.SH SYNOPSIS
+
+\fBsgitopnm\fP
+
+[\fB-verbose\fP]
+
+[\fB-channel\fP \fIc\fP]
+
+[\fISgiFileName\fP]
+
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+\fBsgitopnm\fP 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.
+.PP
+Alternatively, the program produces a PGM image of any one of the
+channels in the input file.
+.PP
+Before Netpbm 10.67 (June 2014), \fBsgitopnm\fP does not work on 2-channel
+SGI images.  It fails if you try.
+.PP
+If you don't specify the \fISgiFileName\fP argument, input is from
+Standard Input.
+.PP
+Before Netpbm 10.67 (June 2014), \fBsgitopnm\fP requires its input to
+be a seekable file, so for example you can't feed it from a pipe.
+
+
+.UN options
+.SH OPTIONS
+
+
+.TP
+\fB-verbose\fP
+Give some information about the SGI image file.
+
+.TP
+\fB-channel\fP \fIn\fP
+Extract channel \fIn\fP of the image as a PGM image.
+.sp
+Without this option, \fBsgitopnm\fP 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.
+.sp
+A 2-channel image is grayscale plus transparency, so you can get
+the transparency information with \fB-channel=2\fP.  You could then
+combine them into a PAM image of tuple type GRAYSCALE_ALPHA with
+\fBpamstack\fP.
+
+
+
+.UN references
+.SH REFERENCES
+.PP
+The SGI image format specification version 1.0 is at
+ftp://ftp.sgi.com/graphics/grafica/sgiimage.html .
+.PP
+There is an example SGI file at 
+https://github.com/ZaaLabs/ZaaIL-TestImages/tree/master/SGI .
+
+
+.UN seealso
+.SH SEE ALSO
+.BR "pnm" (5)\c
+\&,
+.BR "pam" (5)\c
+\&,
+.BR "pnmtosgi" (1)\c
+\&,
+.BR "pamstack" (1)\c
+\&
+
+
+.UN author
+.SH AUTHOR
+.PP
+Copyright (C) 1994 by Ingo Wilken
+(\fI
+Ingo.Wilken@informatik.uni-oldenburg.de\fP)
+.SH DOCUMENT SOURCE
+This manual page was generated by the Netpbm tool 'makeman' from HTML
+source.  The master documentation is at
+.IP
+.B http://netpbm.sourceforge.net/doc/sgitopnm.html
+.PP
+\ No newline at end of file