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openexr openexr documentation skip to main content back to top ctrl k concepts tools api python install license news about test images search ctrl k system settings light dark github pypi slack search ctrl k concepts tools api python install license news about test images system settings light dark github pypi slack openexr openexr provides the specification and reference implementation of the exr file format the professional grade image storage format of the motion picture industry the purpose of the exr format is to accurately and efficiently represent high dynamic range scene linear image data this is a significant difference from most image formats which store images that are ready for display software may need to process openexr images differently from other image formats such as jpeg see scene linear image representation for more details openexr files have strong support for multi part multi channel use cases and extensive representation of associated metadata openexr is widely used in host application software where accuracy is critical such as photorealistic rendering texture access image compositing deep compositing and di openexr is a project of the academy software foundation latest news october 2 2026 openexr 3 5 2 released patch release that introduces the use of openjph s built in lut to apply the decode encode transfer function for lossy lj2k compression ️ warning exr files written by openexr v3 5 0 and v3 5 1 using lossy lj2k compression lack the lut in their codestream and should be regenerated this v3 5 2 release includes a backwards compatibility fallback so that such files can be successfully decoded but for best results please regenerate any files using lj2k written by v3 5 0 and v3 5 1 note that this was incorrectly reported as being included in v3 5 0 also in this release prebuilt wheels python 3 14 fix for a bug when when statically linking when libdeflate zstd or openjph is found via pkg config rather than cmake config 2673 pin the imath_tag to v3 2 3 it was previously incorrectly set to main pin the jpeg 2000 progression order to rpcl and adds tlm markers to allow efficient random access to resolution layers for j2k compression 2672 fix for a failure case in exrcheck involving large images 2688 imath the openexr project includes imath a basic light weight and efficient c representation of 2d and 3d vectors and matrices and other simple but useful mathematical objects functions and data types common in computer graphics applications including the half 16 bit floating point type imath also includes optional python bindings for all types and functions including optimized implementations of vector and matrix arrays quick start you can install openexr using package managers or build the library yourself from the source on github following the compile instructions for a simple program that uses the c api to read and write a exr file see the hello world examples community ask a question email openexr dev lists aswf io slack academysoftwarefdn openexr attend a meeting technical steering committee meetings are open to the public fortnightly on thursdays 1 30pm pacific time calendar https zoom lfx platform linuxfoundation org meetings openexr meeting notes https wiki aswf io display oexr tsc meetings report a bug submit an issue academysoftwarefoundation openexr issues report a security vulnerability email security openexr com contribute a fix feature or improvement read the contribution guidelines and code of conduct sign the contributor license agreement submit a pull request academysoftwarefoundation openexr if you d like to contribute and could use some ideas of what to do browse good first issues here or on clotributor resources reference images academysoftwarefoundation openexr images security policy security md release notes changes md contributors contributors md porting guide openexr imath 2 x to 3 x porting guide next openexr concepts on this page latest news imath quick start community resources show source copyright openexr a series of lf projects llc for web site terms of use trademark policy and other project policies please see https lfprojects org