1img-sgi(n)                            Img                           img-sgi(n)
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NAME

8       img-sgi - Img, SGI Native Format (sgi)
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SYNOPSIS

11       package require Tk
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13       package require img::sgi  ?1.4?
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15       image create photo ?name? ?options?
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DESCRIPTION

20       The  package  img::sgi  is  a sub-package of Img. It can be loaded as a
21       part of the complete Img support, via package require Img,  or  on  its
22       own, via package require img::sgi.
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24       Like  all packages of Img it does not provide new commands, but extends
25       the existing Tk command image so  that  it  supports  files  containing
26       raster  images  in  the  SGI  Native  Format  (sgi).  More specifically
27       img::sgi extends Tk's photo image type.
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29       The name of the new format handler is sgi.  This handler  provides  new
30       additional  configuration options. See section SGI OPTIONS for more de‐
31       tailed explanations.
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33       All of the above means that in a call like
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35       image create photo ?name? ?options?
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37       [1]    Image data in sgi format (options -data and -file)  is  detected
38              automatically.
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40       [2]    The format name sgi is recognized by the option -format.  In ad‐
41              dition the value for the option is treated as list and may  con‐
42              tain any of the special options listed in section SGI OPTIONS.
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SUPPORTED SGI TYPES

45               24-bit pixels: True-color (RGB, each channel 8 bit).
46               32-bit pixels: True-color with alpha channel (RGBA, each channel 8 bit).
47               48-bit pixels: True-color (RGB, each channel 16 bit).
48               64-bit pixels: True-color with alpha channel (RGBA, each channel 16 bit).
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50               List of currently supported features:
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52               Type   |     Read      |     Write     |
53                      | -file | -data | -file | -data |
54               ----------------------------------------
55               24-bit | Yes   | Yes*  | Yes   | Yes*  |
56               32-bit | Yes   | Yes*  | Yes   | Yes*  |
57               48-bit | Yes   | Yes*  | No    | No    |
58               64-bit | Yes   | Yes*  | No    | No    |
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60               *: Implemented by reading/writing from/to a temporary file. This will
61                  be slow for larger images.
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63               All images types may be either uncompressed or run-length encoded.
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SGI OPTIONS

67       The handler provides the following options:
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69       -verbose bool
70              This option is supported for reading and writing.
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72              If  set  to true, additional information about the loaded/stored
73              image is printed to stdout. Default is false.
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75       -compression type
76              This option is supported for writing only.
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78              Set the compression mode to either none or rle.  Default is rle.
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80       -matte bool
81              This option is supported for reading and writing.
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83              If set to false, a matte (alpha) channel is ignored during read‐
84              ing or writing. Default is true.
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SEE ALSO

87       img-bmp, img-dted, img-gif, img-ico, img-intro, img-jpeg, img-pcx, img-
88       pixmap, img-png, img-ppm, img-ps, img-raw, img-sgi,  img-sun,  img-tga,
89       img-tiff, img-window, img-xbm, img-xpm
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KEYWORDS

92       image handling, sgi, tk
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95       Copyright (c) 1995-2009 Jan Nijtmans <nijtmans@users.sourceforge.net>
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100img-sgi                               1.4                           img-sgi(n)
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