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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:
ILM has released OpenEXR as free software. The OpenEXR software distribution includes:
The OpenEXR software distribution is now licensed under the modified BSD license, available here.
AnnouncementsJuly 31st, 2012 - OpenEXR v1.7.1 has been released and is available for download. This release includes the following components:
Of particular note is the introduction of PyIlmBase. This module forms a comprehensive set of python bindings to the IlmBase module. In addition, contained in this release is a number of additions to Imath as well as a minor tweak to Imath::Frustrum (for better support for Windows platforms) as well as other minor fixes, including correction for soname version of IlmImf. --- June 18, 2012 - We're pleased to announce the first public Beta release of OpenEXR v2. Development of OpenEXR v2 has been undertaken in a collaborative environment (cf. previous github announcement) comprised of Industrial Light & Magic, Weta Digital as well as a number of other contributors. Some of the new features included in the Beta.1 release of OpenEXR v2 are: * Deep Data. Pixels can now store a variable length list of samples. The main rationale behind deep-images is to have multiple values at different depths for each pixel. OpenEXR v2 supports both hard surface and volumetric representation requirements for deep compositing workflows. * Multi-part image files. With OpenEXR v2, files can now contain a number of separate, but related, images in one file. Access to any part is independent of the others; in particular, no access of data need take place for unrequested parts. In addition, OpenEXR v2 also contains platform independent mechanisms for handling co-existing library version conflicts in the same process space. (Currently implemented in IlmImf) Finally, a reminder that this is a Beta release and potentially incompatible changes may be introduced in future releases prior to the v2.0.0 production version. OpenEXR v2Beta.1 can be found at: https://github.com/openexr/openexr/tree/v2_beta.1 --- June 18, 2012 - We're pleased to announce that the OpenEXR source code is moving to github.com. You can browse, download and branch the code at www.github.com/openexr/openexr. We're looking forward to taking advantage of the collaborative features presented by git and github.com and of course community contributions. Please see the developer Wiki pages for more information regarding participation. --- July 23, 2010 - New feature version of OpenEXR is now available. This release includes support for stereoscopic images, please see the adjoining documentation in the MultiViewOpenEXR.pdf. (Many thanks to Weta Digital for their contribution.) In addition, we added support for targeting 64 bit Windows, fixes for buffer overruns and a number of other minor fixes, additions and optimisations. Please see the Changelog files for more detailed information. OpenEXR 1.7.0, OpenEXR_Viewers 1.0.2, IlmBase 1.0.2 and OpenEXR-Images-1.7.0 can be downloaded from the downloads section of www.openexr.com --- October 22, 2007 - New versions of OpenEXR and CTL are now available.
This release fixes a buffer overrun in OpenEXR and a Windows build problem
in CTL, and it removes a few unnecessary files from the .tar.gz packages. --- August 3, 2007 - New stable versions of OpenEXR and CTL are now available. The source code has been tested on Linux, Mac OS X and Windows (Visual Studio 7 and 8). Here's a summary of what has changed since the last release: OpenEXR 1.6.0
CTL 1.4.0
OpenEXR_CTL 1.0.0
OpenEXR_Viewers 1.0.0
IlmBase 1.0.0
OpenEXR 1.6.0, OpenEXR_Viewers 1.0.0 and IlmBase 1.0.0 can be downloaded from the downloads section of www.openexr.com. CTL 1.4.0 and OpenEXR_CTL 1.0.0 can be downloaded from http://www.oscars.org/council/ctl.html. --- January 22, 2007 - CTL has been released. The Color Transformation Language, or CTL, is a programming language for digital color management. Color management requires translating images between different representations or color spaces. CTL allows users to describe color transforms in a concise and unambiguous way by expressing them as programs. In order to apply a given transform to an image, a color management system instructs a CTL interpreter to load and run the CTL program that describes the transform. The image viewers included in the OpenEXR software distribution, exrdisplay and playexr, both support color rendering via CTL. For more information see http://www.openexr.com/OpenEXRViewers.pdf. Sorce code and documentation for the CTL interpreter can be downloaded from http://ampasctl.sourceforge.net. Please note the license under which CTL is distributed; it is similar but not identical to the OpenEXR license.
--- January 4, 2007 - OpenEXR wins an Academy Award for Technical Achievement. The Academy of Motion Picture Arts and Sciences today announced the 15 winners of Scientific and Technical Academy Awards. A Technical Achievement Award goes to Florian Kainz for the design and engineering of OpenEXR, a software package implementing 16-bit, floating-point, high dynamic range image files. Widely adopted, OpenEXR is engineered to meet the requirements of the visual effects industry by providing for lossless and lossy compression of tiered and tiled images. Congratulations to all for making OpenEXR such a success!!! Click here for the official Press Release --- December 15, 2006 - A new development version of OpenEXR is now available. We have tested the code in this version internally at ILM, but we would like to get feedback from others before we release a production version. The new version includes several significant changes:
--- August 8, 2006 - We have released an updated set of sample OpenEXR images. This release includes several new images that are useful for testing OpenEXR applications. The images are organized by subdirectory according to their image type or purpose. Several of these subdirectories contain README files that explain the contents of the images in those subdirectories. --- August 2, 2006 - OpenEXR 1.4.0 is now available. This is the next major production-ready release of OpenEXR and offers full compatibility with our last production release, which was 1.2.2. This version obsoletes versions 1.3.x, which were test versions for 1.4.0. If you have been using 1.3.x, please upgrade to 1.4.0. --- June 8, 2006 - OpenEXR 1.3.0 is now available. This is a test release. The major new feature in this version is support for multithreaded file I/O. We've been testing the threaded code internally at ILM for a few months, and we have not encountered any bugs, but we'd like to get some feedback from others before we release the production version. Here's a summary of the changes since version 1.2.2:
--- March 15, 2005 - We're pleased to announce the release of OpenEXR 1.2.2. This is a relatively minor update to the project, with the following changes:
--- August 10, 2004 - ILM's OpenEXR color management proposal, presented at the Siggraph 2004 "OpenEXR, Film and Color" Birds of a Feather meeting, is now available online. See the documentation section. --- June 6, 2004 - OpenEXR 1.2.1 is now available. This is a fairly minor release, mostly just a few tweaks, a few bug fixes, and some new documentation. Here are the most important changes:
--- May 11, 2004 - OpenEXR 1.2.0 is now available. This is the first official, production-ready release since OpenEXR 1.0.7. If you have been using the development 1.1 series, please switch to 1.2.0 as soon as possible. We believe that OpenEXR 1.2.0 is ready for use in shipping applications. We have been using it in production at ILM for several months now with no problems. There are quite a few major new features in the 1.2 series as compared to the original 1.0 series:
--- Mar 27, 2004 - OpenEXR 1.1.1 is now available. This another development release. We expect to release a stable version, 1.2, around the end of April. Version 1.1.1 includes support for PXR24 compression, and for high-dynamic-range luminance/chroma images with subsampled chroma channels. Version 1.1.1 also fixes a bug in the 1.1.0 tiled file format. --- Mar 27, 2004 - We are pleased to announce that Pixar Animation Studios has contributed code to OpenEXR for a new lossy compression method, which compresses 32-bit floating-point data quite a bit better than OpenEXR's other compressors. This new compressor is called PXR24 and is available as of the 1.1.1 development release of OpenEXR. It will also be included in the upcoming 1.2 stable release. Thanks to Loren Carpenter and Dana Batali of Pixar, for making this happen! --- Feb 6, 2004 - OpenEXR 1.1.0 is now available. This is a major new release with support for tiled images, multi-resolution files (mip/ripmaps), environment maps, and abstracted file I/O. We've also released a new set of images that demonstrate these features, and updated the CodeWarrior project and Photoshop plugins for this release. See the downloads section for the source code and the new images. --- Jan 8, 2004 - Industrial Light & Magic has released the source code for an OpenEXR Shake plugin. The plugin is supported on Shake 3.0 on the GNU/Linux and MacOS X platforms. See the downloads section. --- Jan 7, 2004 - OpenEXR 1.0.7 is now available. In addition to some bug fixes, this version adds support for some new standard attributes, such as primary and white point chromaticities, lens aperture, film speed, image acquisition time and place, and more. If you want to use these new attributes in your applications, see the ImfStandardAttributes.h header file for documentation. Our project hosting site, Savannah, is still recovering from a compromise last month, so in the meantime, we're hosting file downloads here. Some of the files are not currently available, but we're working to restore them. --- April 3, 2003 - OpenEXR release 1.0.5 is now available. It includes support for Windows and improved support for OS X. It also includes support for hardware rendering of OpenEXR images on NVIDIA GeForce FX and Quadro FX video cards. See the downloads section for source code and prebuilt packages for Windows, OS X 10.2, and RedHat. --- April 3, 2003 - Industrial Light & Magic has released the source code for an OpenEXR display driver for Pixar's Renderman. This display driver is covered under the OpenEXR free software license. See the downloads section for the source code. --- January 22, 2003 - OpenEXR Press Release click here --- January 22, 2003 - openexr.com web site is officially launched. Supported PlatformsOpenEXR has been ported to GNU/Linux, OS X 10.2, Win32, and IRIX. It should be fairly easy to port to other UNIX-like operating systems. © OpenEXR, Industrial Light & Magic and ILM are trademarks and service marks of Lucasfilm Ltd.; all associated intellectual property is protected by the laws of the United States and other countries. All rights reserved.
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