SGI (image file format)

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|formattype=electronic
 
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|subcat=Graphics
|extensions={{ext|sgi}}<br>{{ext|bw}}<br>{{ext|rgb}}<br>{{ext|rgba}}
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|extensions={{ext|sgi}}, {{ext|bw}}, {{ext|rgb}}, {{ext|rgba}}
 
|pronom={{PRONOM|x-fmt/140}}
 
|pronom={{PRONOM|x-fmt/140}}
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|wikidata={{wikidata|Q7514956}}
 
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'''SGI''' is a raster image file format. The image may be uncompressed, or use
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'''SGI''' (also known as '''IRIS''', and sometimes called '''RGB''' or '''Irix RGB''') is a raster image file format. The image may be uncompressed, or use [[Run-length encoding|RLE]] compression.
[[Run-length encoding|RLE]] compression.
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SGI probably stands for '''Silicon Graphics Image'''.
 
SGI probably stands for '''Silicon Graphics Image'''.
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== Image types ==
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SGI supports the following image types:
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* Grayscale, 8 or 16 bits/sample
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* RGB, 8 or 16 bits/sample
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* RGBA, 8 or 16 bits/sample
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* RGB 3-3-2, 8 bits/pixel (obsolete)
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* Colormapped (but no palette is stored in the file) (obsolete)
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* Colormap (file contains only a palette; no image) (obsolete)
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== Format ==
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SGI files start with a 512-byte fixed header, most of which is unused. If the image is uncompressed, the pixel data follows. Compressed images have a scanline table, followed by the compressed pixel data.
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The pixel data is stored from bottom-up, instead of top-down as in most image formats.
  
 
== Identification ==
 
== Identification ==
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== Software ==
 
== Software ==
* [http://netpbm.sourceforge.net/ Netpbm]
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* [[Konvertor]]
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* [[Netpbm]]: pnmtosgi, sgitopnm
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* [[ImageMagick]] (format named "SGI")
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* [[Tom's Viewer]]
 
* [http://svn.osgeo.org/grass/grass/branches/releasebranch_5_5/src.contrib/CERL/SGI/libimage/ libimage]
 
* [http://svn.osgeo.org/grass/grass/branches/releasebranch_5_5/src.contrib/CERL/SGI/libimage/ libimage]
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== Sample files ==
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* [http://ftp.funet.fi/index/graphics/packages/volvis/RGB.tar.Z RGB.tar.Z]
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* https://telparia.com/fileFormatSamples/image/sgi/
  
 
== External links ==
 
== External links ==
 
* [[Wikipedia:Silicon Graphics Image|Wikipedia article]]
 
* [[Wikipedia:Silicon Graphics Image|Wikipedia article]]
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* {{EGFF|sgiimage|SGI Image File Format File Format Summary}}, from the [[Encyclopedia of Graphics File Formats]]
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[[Category:Silicon Graphics]]

Revision as of 16:48, 1 August 2020

File Format
Name SGI (image file format)
Ontology
Extension(s) .sgi, .bw, .rgb, .rgba
PRONOM x-fmt/140
Wikidata ID Q7514956

SGI (also known as IRIS, and sometimes called RGB or Irix RGB) is a raster image file format. The image may be uncompressed, or use RLE compression.

SGI probably stands for Silicon Graphics Image.

Contents

Image types

SGI supports the following image types:

  • Grayscale, 8 or 16 bits/sample
  • RGB, 8 or 16 bits/sample
  • RGBA, 8 or 16 bits/sample
  • RGB 3-3-2, 8 bits/pixel (obsolete)
  • Colormapped (but no palette is stored in the file) (obsolete)
  • Colormap (file contains only a palette; no image) (obsolete)

Format

SGI files start with a 512-byte fixed header, most of which is unused. If the image is uncompressed, the pixel data follows. Compressed images have a scanline table, followed by the compressed pixel data.

The pixel data is stored from bottom-up, instead of top-down as in most image formats.

Identification

SGI files begin with bytes 01 DA.

Specifications

Software

Sample files

External links

Personal tools
Namespaces

Variants
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