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





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



  

  





  
[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:



  

  
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.

  

  

  
This option is supported for writing only.
    
Set the compression mode to either none or rle.
        Default is rle.

  

  

  
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>








  

    1.4
    img-sgi