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Cryptomatte is a method developed by Psyop for efficiently encoding accurate mattes. It typically uses three to five automatically generated render channels stored in a multichannel OpenEXR file which removes the hassle of creating dozens or hundreds of Multimattes. Using the Cryptomatte plugin for Nuke or Fusion, mattes can be extracted through directly picking objects or entering object names. Note that single-channel EXR files using DWA compression are supported, in addition to multichannel EXR files.

Compared to the Multi Matte Render Element, Cryptomatte does not require any additional setup to the scene, like specifying object IDs, material IDs, etc

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title UI Path: ||Display Render Settings button|| > Render Elements tab > Cryptomatte
Section Column width 25%   Column width 50% Multiexcerpt include MultiExcerptName RE PageWithExcerpt Render Elements Column width 25%   Image Removed   To use render elements, select from the Available render elements column and click the Add button to add the passes you wish to generate at render time. When you render the scene, the added render elements listed in the column on the right, will also render, which can be viewed from the VFB window's channel drop-down menu. For more information on the parameters on this dialog, see the Render Elements tab page.

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