Format introduced by Sigma SD9 and SD10 digital camera. The Sigma DP1 uses it with some variations.

Official spec: (via the Internet Archive) - local copy

But the RAW data is “encrypted”. dcraw has code in GPL but no documentation per see. [] ( (via the Internet Archive) is a project to try to document this.

  • X3F Foveon, the Foveon partial documentation (via the Internet archive - 2007-08-07).