OpenEXR is a high dynamic range imaging image file format, released as an open standard along with a set of software tools created by Industrial Light and Magic, released under an open source license similar to the BSD license.
It is notable for supporting 16-bit floating point values ("half precision"), with a sign bit, five bits of exponent, and a ten-bit mantissa. This allows a dynamic range of over thirty stops of exposure, and is directly supported by the Cg programming language.
Lossless compression of high dynamic range data is also supported.
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