Bob Friesenhahn is developing the freeware program GraphicsMagick to include file formats used by the majority of digital intermediate processes. He is looking for people with technical expertise in this area to help him out.

For the past couple of months, I have been working to develop
high-quality support for the latest SMPTE DPX format. This would
include support for Cineon Log encoding. While there is some DPX
support (written by David Hodson) in the GIMP and CinePaint packages,
the support is focused on the most common uses of DPX in film rather
than being a “from spec” implementation which attempts to support the
many variations possible within the specification. Other than David’s
work, I have been unable to find any free support for DPX. A number
of people in the film and video industry have sent me sample DPX
files, and GraphicsMagick has been able to read all of them.