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img-sgi(n)                                                                                        img-sgi(n)



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NAME
       img-sgi - Img, SGI Native Format (sgi)

SYNOPSIS
       package require Tk

       package require img::sgi  ?1.4?

       image create photo ?name? ?options?

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DESCRIPTION
       The package img::sgi is a sub-package of Img. It can be loaded as a part of the complete Img support,
       via package require Img, or on its own, via package require img::sgi.

       Like all packages of Img it does not provide new commands, but extends the existing Tk command  image
       so  that it supports files containing raster images in the SGI Native Format (sgi). More specifically
       img::sgi extends Tk's photo image type.

       The name of the new format handler is  sgi.   This  handler  provides  new  additional  configuration
       options. See section SGI OPTIONS for more detailed explanations.

       All of the above means that in a call like

       image create photo ?name? ?options?


       [1]    Image data in sgi format (options -data and -file) is detected automatically.

       [2]    The format name sgi is recognized by the option -format.  In addition the value for the option
              is treated as list and may contain any of the special options listed in section SGI OPTIONS.


SUPPORTED SGI TYPES
        24-bit pixels: True-color (RGB, each channel 8 bit).
        32-bit pixels: True-color with alpha channel (RGBA, each channel 8 bit).
        48-bit pixels: True-color (RGB, each channel 16 bit).
        64-bit pixels: True-color with alpha channel (RGBA, each channel 16 bit).

        List of currently supported features:

        Type   |     Read      |     Write     |
               | -file | -data | -file | -data |
        ----------------------------------------24-bit ---------------------------------------24-bit
        24-bit | Yes   | Yes*  | Yes   | Yes*  |
        32-bit | Yes   | Yes*  | Yes   | Yes*  |
        48-bit | Yes   | Yes*  | No    | No    |
        64-bit | Yes   | Yes*  | No    | No    |

        *: Implemented by reading/writing from/to a temporary file. This will
           be slow for larger images.

        All images types may be either uncompressed or run-length encoded.


SGI OPTIONS
       The handler provides the following options:

       -verbose bool
              This option is supported for reading and writing.

              If set to true, additional information about the loaded/stored image  is  printed  to  stdout.
              Default is false.

       -compression type
              This option is supported for writing only.

              Set the compression mode to either none or rle.  Default is rle.

       -matte bool
              This option is supported for reading and writing.

              If  set  to  false,  a  matte (alpha) channel is ignored during reading or writing. Default is
              true.



SEE ALSO
       img-bmp, img-dted, img-gif, img-ico, img-intro, img-jpeg, img-pcx, img-pixmap, img-png, img-ppm, img-ps, imgps,
       ps, img-raw, img-sgi, img-sun, img-tga, img-tiff, img-window, img-xbm, img-xpm

KEYWORDS
       image handling, sgi, tk

COPYRIGHT
       Copyright (c) 1995-2009 Jan Nijtmans <nijtmans@users.sourceforge.net>




Img                                                  1.4                                          img-sgi(n)