NAME

       img-sgi - Img, Silicon Graphics Format (sgi)

SYNOPSIS

       package require Tk

       package require img::sgi  ?1.4?

       image create photo ?name? ?options?

_________________________________________________________________________________________________

DESCRIPTION

       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  Silicon  Graphics
       Format (sgi). More specifically img::sgi extends Tk's photo image type.

       The name of the new format handler is sgi.

       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.

       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 | 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 string
              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-flir, img-gif, img-ico, img-intro, img-jpeg, img-pcx, img-pixmap,
       img-png, img-ppm, img-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) 1995-2023 Jan Nijtmans <nijtmans@users.sourceforge.net>