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OpenEXR is a high dynamic-range (HDR) image file format developed by
Industrial Light & Magic for use in computer imaging applications.
OpenEXR is used by ILM on all motion pictures currently in production.
The first movies to employ OpenEXR were Harry Potter and the Sorcerers
Stone, Men in Black II, Gangs of New York, and Signs. Since then, OpenEXR
has become ILM's main image file format.
OpenEXR's features include:
* Higher dynamic range and color precision than existing 8- and 10-bit
image file formats.
* Support for 16-bit floating-point, 32-bit floating-point, and 32-bit
integer pixels. The 16-bit floating-point format, called "half", is
compatible with the half data type in NVIDIA's Cg graphics language and
is supported natively on their new GeForce FX and Quadro FX 3D graphics
solutions.
* Multiple lossless image compression algorithms. Some of the included
codecs can achieve 2:1 lossless compression ratios on images with film
grain.
* Extensibility. New compression codecs and image types can easily be added
by extending the C++ classes included in the OpenEXR software
distribution. New image attributes (strings, vectors, integers, etc.) can
be added to OpenEXR image headers without affecting backward compatibility
with existing OpenEXR applications.
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