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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.
- ILM has released OpenEXR as free software. The OpenEXR software distribution includes:
- * IlmImf, a library that reads and writes OpenEXR images.
- * Half, a C++ class for manipulating half values as if they were a
- built-in C++ data type.
- Imath, a math library with support for matrices, 2d- and
- * 3d-transformations, solvers for linear/quadratic/cubic equations,
- and more.
- Applications and documentations are available as separate OpenBSD packages:
- OpenEXR-tools and OpenEXR-doc.
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