The master that the Boonshoft rendered from was a series of .png files with a color Bit Depth of 48.
They converted the master using Evans and Sutherland proprietary software to a "dome master".
I have worked on this project for just over two years with most of the time spent on file formats and CODECs as Evans and Sutherland formats are not well defined. They want you to use their software. Blender software provided the animation and all rendering.