OpenEXR, often called EXR, is an image file format originally developed by Industrial Light & Magic (ILM), and released under a free and open source license in 2003. It's become a widely adopted standard to store and exchange raster data.
When using the OpenEXR format, it may be hard to determine what is the best data compression to use, and the question is raised very often. This document is an attempt to answer it, depending on what is your need with the file and what type of image youÕre storing.