Cryptomatte

Cryptomatte is a piece of open-source software created by Jonah Friedman and Andy Jones at Psyop. It is also used synonymously for the specific style of image created by the software or other software working alike.

Cryptomatte is a quasi-standard in the industry, because of its ubiquity, integration into popular 3D graphics software, and ease of use.

Render processing The program itself creates an ID matte of a scene that can be used to create for example image masks for single or multiple objects in the scene. The ID matte has a very distinctive look and itself is sometimes referred to as cryptomatte. These cryptomatte images are in general very colourful assigning each object or material a different random colour. The program creates mattes that support motion blur, transparency and depth of field using data that is already available at render time.Cryptomatte on github.com

Supported render engines Cryptomatte images can be created by several 3D graphic programs like Blender,Cryptomatte Node on docs.blender.org Autodesk Maya,Cryptomatte in Maya on rmanwiki.pixar.com Autodesk 3ds MaxCryptomatte on docs.arnoldrenderer.com or HoudiniCryptomatte on sidefx.com and are usually exported using the OpenEXR file format.

Whether a program is able to generate a cryptomatte or not is determined by the render engine being used. If a program supports more than one render engine it is possible that it can generate cryptomatte images with one engine while being unable to do so with the other one. Blender, for example, had no option to create a cryptomatte image before version 2.80.Blender 2.80 Release Notes: Cycles on wiki.blender.org With version 2.80, only the "Cycles" path-tracing render engine supported creating a cryptomatte whereas "Eevee", the newly added real-time render engine, did not. The support to create cryptomatte images was added to Eevee with version 2.92 that was published on February 25, 2021index of blender 2.92 release on download.blender.org one and a half years after Eevee was first published.Blender 2.92 Release Notes: EEVEE on wiki.blender.org

The following render engines are known to support creating cryptomatte images:

Render engine name Shipped with Added with version ArnoldCryptomatte Shader docs.arnoldrenderer.comSolid Angle ships Arnold 5.2.1. CG Channel. October 23, 2018 Autodesk 3ds MaxAutodesk Maya Arnold 5.2 Cycles Blender Blender 2.80 Eevee Blender Blender 2.92 Mantra Houdini Houdini 16.5 KarmaKarma Renderer FAQs. SideFX Houdini Houdini 18.5 Modo renderer / mPathFoundry ships Modo 14.2. CG Channel. November 13, 2020 ModoFoundry announces strategic decision to wind down development of Modo. Foundry.com. November 7, 2024 Modo 14.2 RedshiftRedshift Version 2.6.11リリースノート . Born Digital. June 12, 2018 Cinema 4D (CPU-only) Redshift 2.6.11 3DelightChangelog - 3DELIGHT. DNA Research Katana 3Delight 1.7.32 Unreal Engine (Movie Render Queue)Movie Render Queue Render Passes. Epic Games Unreal Engine 4.26 Radeon ProRenderAMD ships Radeon ProRender 3.1 for Blender and Maya. CG Channel. April 1, 2021. Radeon ProRender 3.1 Octane RenderCRYPTOMATTE on aoktar.com RenderManPxrCryptomatte on rmanwiki.pixar.com V-RayUsing the Cryptomatte In V-Ray for 3ds Max on tutorials.cgrecord.net

Supported compositing software

Compositing software name Added with version Autodesk Flame 2020Autodesk ships Flame 2020. CG Channel. April 16, 2019 After Effects 17.0Adobe ships After Effects 17.0. CG Channel. November 4, 2019 Nuke 13.0Foundry ships Nuke, NukeX, Nuke Studio & Nuke Indie 13.0. CG Channel. March 17, 2021.Blackmagic Fusion20 Blender (Compositing Nodes) 2.8 Houdini (COP) 16.5What’s new in Houdini 16.5 Side Effects Software V-Ray (V-Ray Frame Buffer) 5 Update 1Chaos releases V-Ray 5 for 3ds Max Update 1. CG Channel. February 24, 2021 Adobe Photoshop Exr-IO 2.0New: Exr-io 2.00 with cryptomatte support. Exr-IO is a third-party pluginGaffer0.61.2.0

Workflow example In a 3D scene a cryptomatte image can be created that assigns a unique ID to each object. The objects usually also have distinct colours that make a scene with many objects very colourful. The ID matte can be used to pick one or more objects in a scene. The ID matte can either be exported or it can be used by the 3D software itself for compositing.

An example workflow would be to use the cryptomatte image to generate a mask that itself is used to limit an effect to only a certain part of the image. It can thereby be used to quickly create masks without the need of re-rendering a whole scene.

The example workflow for images:

The same workflow for video files:

The masks in the examples can be used to limit a visual effect so that only the cube in the middle is affected.

Licensing The developers published the program's source code and licensed it under the BSD 3-clause license "to turn it into an ecosystem around an open standard". Their goal was "to see a diverse ecosystem of renderers that can create Cryptomatte images and plugins for compositing applications to decode them".

Cryptomatte

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