Silicon Graphics Image

Updated on Dec 11, 2024

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Filename extension .sgi (among others) Type code '.SGI'		Internet media type image/sgi Developed by Paul Haeberli
Initial release 0.95 / 1995; 22 years ago (1995) Latest release 1.00(1996; 21 years ago (1996))

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

Background

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

This format was originally developed for IRIX. The master files of the SVT High Definition Multi Format Test Set are SGIs. Frame 200 of the ParkJoy sequence in this set (15722.sgi, 3840×2160, 47.4 MB) was used in WebP comparisons.

References

Silicon Graphics Image Wikipedia

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