Silicon Graphics Image

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Silicon Graphics Image
Silicon Graphics logo.png
FFmpeg.PC.png
Filename extension .sgi (among others)
Internet media type image/sgi[1]
Type code '.SGI'
Developed by Paul Haeberli
Initial release 0.95 / 1995; 19 years ago (1995)[2][3]
Latest release 1.00  / 1996; 18 years ago (1996)
Type of format image file
Standard SGI Image File Format[4]

Silicon Graphics Image (SGI) or the RGB file format is the native raster graphics file format for Silicon Graphics workstations.[3] The format was invented by Paul Haeberli.[3] It can be run-length encoded (RLE). Among others FFmpeg and ImageMagick support this format.

Background[edit]

Common file extensions are:

.sgi or .rgb
3 colour channels
.rgba
3 colour channels and alpha
.bw or .int
black and white
.inta
black and white and alpha

Originally developed for IRIX XnView also accepts file extension .iris. The master files of the SVT High Definition Multi Format Test Set are SGIs.[5][6][7] Frame 200 of the ParkJoy sequence in this set (15722.sgi, 3840×2160, 47.4 MB) was used in WebP comparisons.

See also[edit]

References[edit]

  1. ^ .sgi MIME type not registered at IANA
  2. ^ Paul Haeberli (1996). "The SGI Image File Format 0.97". Silicon Graphics. Archived from the original on 2009-01-11. Retrieved 2014-03-07. 
  3. ^ a b c James D. Murray, William vanRyper (1996-04). "Encyclopedia of Graphics File Formats, Second Edition". O'Reilly. ISBN 1-56592-161-5. Retrieved 2014-03-07. 
  4. ^ Paul Haeberli (1996). "The SGI Image File Format 1.00". Silicon Graphics. Retrieved 2014-03-07. 
  5. ^ Lars Haglund (2006-02). "The SVT High Definition Multi Format Test Set". SVT. Retrieved 2014-02-23. 
  6. ^ "SVT_MultiFormat/2160p50_CgrLevels_Master_SVTdec05". Video Quality Experts Group (VQEG). 2006. Retrieved 2014-03-01. 
  7. ^ Marta Mrak, Mislav Grgic, Murat Kunt (2010). High-Quality Visual Experience: Creation, Processing and Interactivity of High-Resolution and High-Dimensional Video Signals. Signals and Communication Technology. Springer. pp. 147–154. ISBN 978-3-642-12802-8. LCCN 2010925849.