README
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// OpenEXR
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OpenEXR is a high dynamic-range (HDR) image file format developed by
Industrial Light & Magic (ILM) for use in computer imaging applications.
ILM subsequently released the source code and adjoining material as open
source software.
The distribution has evolved to include support for stereoscopic and deep
images. Weta Digital, Disney, Sony Pictures Imageworks, Pixar and other
visual effects studios have made contributions to the code base. The file
format has since seen wide adoption in a number of industries.
The library, including all contributions, is released under the modified
BSD license.
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.
* Support for sterescopic image workflows and a generalisation to
multi-views.
Added Feature highlights for v2 release
* Flexible support for deep data. Pixels can store a variable-length list of
samples and, thus, it is possible to store multiple values at different
depths for each pixel. Hard surfaces and volumetric data representations
are accomodated.
* Multipart. Ability to encode separate, but related, images in one file.
This allows for access to individual parts without the need to read other
parts in the file.
* Versioning. OpenEXR source allows for user configurable C++
namespaces to provide protection when using multiple versions of the
library in the same process space.
The distribution is divided into the following sub-modules:
* IlmBase
* OpenEXR
* OpenEXR_Viewers
* Photoshop
* PyIlmBase
* d_exr
Please see the README files of each of the individual directories for more
information.
A collection of OpenEXR images are available from the adjecent repository:
openexr-images