Nov 19, 2025 · OpenEXR provides the specification and reference implementation of the EXR file format, the professional-grade image storage format of the motion picture industry.

OpenEXR allows storing of an arbitrary number of extra attributes, of arbitrary type, in an image file. Software that reads OpenEXR files ignores attributes it does not understand.

OpenEXR is a project of the Academy Software Foundation. The format and library were originally developed at Industrial Light & Magic and first released as open source in 2003.

As of OpenEXR release v3.4.4, OpenEXR ships with an internal “vendored” copy of the OpenJPH library. At configuration time, if CMake finds an external installation of OpenJPH, it will use it.

Although the OpenEXR file format supports channels of arbitrary name and number of type uint32, float16, and float32, most programs working with OpenEXR files expect this data to …

This document gives an overview of the layout of OpenEXR 2.0 image files as byte sequences. It covers both single and multi-part formats, and how deep data is handled.

The OpenEXR distribution includes a set of basic utility programs that operate on image files. These do basic conversion between various flavors of exr files (multiview, multipart, tiled, etc) …

In this example, we read an OpenEXR image file using the OpenEXR library’s general interface. We assume that the file contains two channels, R, and G, of type HALF, and one channel, Z, …

The OpenEXR API ¶ There are two separate, independent APIs for reading and writing EXR image files: the traditional C++ API, and the newer C API, referred to as OpenEXRCore.

A series of OpenEXR files that can be used to test if a program that displays images on the screen properly places, crops and pads the images. All files contain the same set of 400 by …