OpenImageIO is an API and library for reading and writing 2D images, extremely flexible (yet simple to use), employing expandable plugins for the specific image formats (currently including TIFF, JPEG, OpenEXR, PNG, and HDR, and growing). There are also classes that allow client code to access truly vast amount of image data with very small in-memory cache, and to do high-quality texture lookups. And finally several image tools that are built on these classes, including image info, image differencing, image format conversion and metadata modification, grep/searching images for text in metadata or other properties, and also a really nice image viewer.
You can get a much better idea of the scope, design sense, and craftsmanship of the project by skimming the documentation: http://www.openimageio.org/openimageio.pdf
It's all cross-platform and BSD licensed.
Contributors include current and former employees of Sony Imageworks, NVIDIA, Pixar, ILM, PDI/Dreamworks, and Google, and this project builds on ideas we have refined over the course of working together on other big commercial projects in graphics and imaging.
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