Although OpenEXR 2.0 is a major version update, files created by the new library that don't exercise the new feature set are completely backwards compatible with previous versions of the library. By using the OpenEXR 2.0 library, performance improvements, namespace versions and basic multi-part/deep reading support should be available to applications without code modifications.
Extracted automatically from Openexr homepage
brew install openexr
The following 2 dependencies will be installed if you install Openexr:
This formula is required by Pixie, OpenSceneGraph, Imagemagick, and 2 other formulas.