Silicon Graphics Image

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Silicon Graphics Image
Filename extension
.sgi (among others)
Internet media type
Type code'.SGI'
Magic number01 DA
Developed byPaul Haeberli
Initial release0.95 / 1995; 26 years ago (1995)[2][3]
Latest release
(1996; 25 years ago (1996))
Type of formatimage file
StandardSGI 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). FFmpeg and ImageMagick, among others, support this format.


Common file extensions are:

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

This format was originally developed for IRIX. 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]


  1. ^ .sgi MIME type not registered at IANA
  2. ^ Paul Haeberli (1996). "The SGI Image File Format 0.97". Silicon Graphics. Retrieved 2014-03-07.[dead link] Alt URL
  3. ^ a b c James D. Murray, William van Ryper (April 1996). "SGI Image File Format File Format Summary". Encyclopedia of Graphics File Formats, Second Edition. O'Reilly. ISBN 1-56592-161-5. Retrieved 2014-03-07.CS1 maint: uses authors parameter (link)
  4. ^ Paul Haeberli (1996). "The SGI Image File Format 1.00". Silicon Graphics. Retrieved 2014-03-07.
  5. ^ Lars Haglund (Feb 2006). "The SVT High Definition Multi Format Test Set" (PDF). 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.CS1 maint: uses authors parameter (link)