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OpenEXR is a high dynamic range raster file format, released as an open standard along with a set of software tools created by Industrial Light & Magic (ILM), under a free software license similar to the BSD license.

A full technical introduction of the format is available on The currently-supported version is OpenEXR 2.3.

The EXR codec in TouchDesigner is supported in the Movie File In TOP and the forthcoming Point File In TOP which reads EXR files with any number of channels.

EXR images are created with (1) the Save Image... menu on TOPs, (2) the .save() python method on TOPs, and (3) the Movie File Out TOP with Type "Image Sequence".

EXR is a broad format for arbitrary numbers of channels, however TouchDesigner currently only extracting 4-channel RGBA images. ​ ​