69 lines
2.7 KiB
Plaintext
69 lines
2.7 KiB
Plaintext
README
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//
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// OpenEXR
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//
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OpenEXR is a high dynamic-range (HDR) image file format developed by
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Industrial Light & Magic (ILM) for use in computer imaging applications.
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ILM subsequently released the source code and adjoining material as open
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source software.
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The distribution has evolved to include support for stereoscopic and deep
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images. Weta Digital, Disney, Sony Pictures Imageworks, Pixar, DreamWorks
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Animation and other studios have made contributions to the code base.
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The file format has seen wide adoption in a number of industries.
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The library, including all contributions, is released under the modified
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BSD license.
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OpenEXR's features include:
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* Higher dynamic range and color precision than existing 8- and 10-bit
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image file formats.
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* Support for 16-bit floating-point, 32-bit floating-point, and
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32-bit integer pixels. The 16-bit floating-point format, called "half",
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is compatible with the half data type in NVIDIA's Cg graphics language
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and is supported natively on their new GeForce FX and Quadro FX 3D
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graphics solutions.
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* Multiple image compression algorithms, both lossless and lossy. Some of
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the included codecs can achieve 2:1 lossless compression ratios on images
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with film grain. The lossy codecs have been tuned for visual quality and
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decoding performance.
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* Extensibility. New compression codecs and image types can easily be added
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by extending the C++ classes included in the OpenEXR software distribution.
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New image attributes (strings, vectors, integers, etc.) can be added to
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OpenEXR image headers without affecting backward compatibility with
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existing OpenEXR applications.
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* Support for sterescopic image workflows and a generalisation to
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multi-views.
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Added Feature highlights for v2 release
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* Flexible support for deep data. Pixels can store a variable-length list of
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samples and, thus, it is possible to store multiple values at different
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depths for each pixel. Hard surfaces and volumetric data representations
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are accomodated.
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* Multipart. Ability to encode separate, but related, images in one file.
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This allows for access to individual parts without the need to read other
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parts in the file.
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* Versioning. OpenEXR source allows for user configurable C++
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namespaces to provide protection when using multiple versions of the
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library in the same process space.
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The distribution is divided into the following sub-modules:
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* IlmBase
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* OpenEXR
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* OpenEXR_Viewers
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* PyIlmBase
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* Contrib
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Please see the README files of each of the individual directories for more
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information.
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A collection of OpenEXR images are available from the adjecent repository:
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openexr-images
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