1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML><HEAD><TITLE>Sgitopnm User Manual</TITLE></HEAD>
<BODY>
<H1>sgitopnm</H1>
Updated: 25 April 2014
<BR>
<A HREF="#index">Table Of Contents</A>
<H2>NAME</H2>
sgitopnm - convert a SGI image file to PNM
<H2 id="synopsis">SYNOPSIS</H2>
<B>sgitopnm</B>
[<B>-verbose</B>]
[<B>-channel</B> <I>c</I>]
[<I>SgiFileName</I>]
<H2 id="description">DESCRIPTION</H2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>sgitopnm</b> 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.
<P>Alternatively, the program produces a PGM image of any one of the
channels in the input file.
<p>Before Netpbm 10.67 (June 2014), <b>sgitopnm</b> does not work on 2-channel
SGI images. It fails if you try.
<p>If you don't specify the <i>SgiFileName</i> argument, input is from
Standard Input.
<p>Before Netpbm 10.67 (June 2014), <b>sgitopnm</b> requires its input to
be a seekable file, so for example you can't feed it from a pipe.
<H2 id="options">OPTIONS</H2>
<DL COMPACT>
<DT><B>-verbose</B>
<DD>Give some information about the SGI image file.
<DT><B>-channel</B> <I>n</I>
<DD>Extract channel <I>n</I> of the image as a PGM image.
<p>Without this option, <B>sgitopnm</B> 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.
<p>A 2-channel image is grayscale plus alpha (transparency), so you can get
the transparency information with <b>-channel=2</b>. You could then
combine them into a PAM image of tuple type GRAYSCALE_ALPHA with
<b>pamstack</b>.
</DL>
<H2 id="references">REFERENCES</H2>
SGI Image File Format documentation (draft v0.95) by Paul Haeberli (<A
HREF="mailto:paul@sgi.com">paul@sgi.com</A>). Available via FTP at
sgi.com:graphics/SGIIMAGESPEC.
<H2 id="seealso">SEE ALSO</H2>
<B><A HREF="pnm.html">pnm</A></B>,
<B><A HREF="pam.html">pam</A></B>,
<B><A HREF="pnmtosgi.html">pnmtosgi</A></B>,
<B><A HREF="pamstack.html">pamstack</A></B>
<H2 id="author">AUTHOR</H2>
<p>Copyright (C) 1994 by Ingo Wilken
(<A HREF="mailto:Ingo.Wilken@informatik.uni-oldenburg.de">
Ingo.Wilken@informatik.uni-oldenburg.de</A>)
<HR>
<H2 id="index">Table Of Contents</H2>
<UL>
<LI><A HREF="#synopsis">SYNOPSIS</A>
<LI><A HREF="#description">DESCRIPTION</A>
<LI><A HREF="#options">OPTIONS</A>
<LI><A HREF="#references">REFERENCES</A>
<LI><A HREF="#seealso">SEE ALSO</A>
<LI><A HREF="#author">AUTHOR</A>
</UL>
</BODY>
</HTML>
|
