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OpenEXR is an open-source high-dynamic-range multi-channel raster file format developed by Industrial Light & Magic in 1999. In 2013 OpenEXR version 2.0 released, with the added support for deep images and multi-part files.
OpenEXR is a good choice for high-quality image processing and storage applications. It supports high-dynamic-range, 1024 steps per f-stop color resolution, lossless and lossy data compression, arbitrary image channels, scan-line and tiled images, multi-resolution images (mipmaps or ripmaps), multi-view images that show the same scene from multiple different points of view, deep images, multi-part files, storing additional image meta-data and fast multi-threaded file reading and writing.
| Name | OpenEXR |
|---|---|
| File Extension(s) | .exr |
| Category | Raster Images |
| Use For | Satellite imagery, physically based rendering, scientific and medical visualization, deep images, 3D stereo imagery, stereo image matching, 3D rendering, implementing fast zoom and pan in large image applications, High Dynamic Range image processing, and digital photography. |
| Developer | Industrial Light & Magic |
| MIME Type(s) | image/x-exr |
| License | Under a free software license similar to the BSD license. |
| File Sample(s) | N/A |
| Compression | Lossless: RLE (Run Length Encoding), ZIP, ZIPS and PIZ. Lossy: PXR24, B44, B44A, DWAA and DWAB. |
| Max Dimensions | N/A |
| Color Modes | N/A |
| Animation | No |
| Transparency | Yes |
| Interlacing | No |
| Metadata | Yes |
| Layers | Yes |
| Multipage | Yes |