OpenEXR

OpenEXR (also known as EXR or IlmImf) is a raster image file format developed by Industrial Light & Magic. It supports high dynamic range images. It usually uses 16-bit "half precision" floating point samples, though other sample formats are also supported.

"OpenEXR" is also the name of the open source C++ library associated with the format.

Identification
Files start with bytes.

Software

 * OpenEXR library: OpenEXR Downloads → openexr-x.x.x.tar.gz. Includes sample OpenEXR files for testing.

Links

 * OpenEXR home page
 * Wikipedia article