OpenEXR/Id isolate any object with a perfect antialiasing

We present a new storage scheme for computer graphic images based on OpenEXR 2. Using such EXR/Id files, the compositing artist can isolate an object selection (by picking them or using a regular expression to match their names) and color corrects them with no edge artefact, which was not possible to achieve without rendering the object selection on its own layer. Using this file format avoids going back and forth between the rendering and the compositing departments because no mask image or layering are needed anymore. The technique is demonstrated in an open source software suite, including a library to read and write the EXR/Id files and an OpenFX plug-in which generates the images in any compositing software.