CryptoMatte for Masks with Motion Blur in Compositing | Blender 4.3 Compositing Basics

Video version: scheduled for February 21, 2025

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Hello everyone!

This is a basic tutorial on how to use the Crypto Matte node in Blender 4.3 to extract object masks in Compositing, especially when your final render includes Motion Blur, like the example I’m showing on screen.

In most of my Blender Compositing tutorials, I usually rely on the ID Mask node, using information from Object Index or Material Index to create object masks and edit them separately in Compositing.

However, this method requires setting up Object Index or Material Index for the elements you want to isolate, which can become quite impractical if there are many elements involved.

Furthermore, the mask generated by the ID Mask node is not very accurate when effects like Depth of Field or Motion Blur are present in your frames, as shown in this example. The quality of the mask produced with ID Mask is lower, which obviously affects the overall compositing quality. So, let’s see how to use the Crypto Matte node instead.

As with many of my other video tutorials, the PDF version of this tutorial is available for free at the link provided in the description. Also, this is a great time to subscribe to the channel and turn on notifications so you won’t miss upcoming video tutorials!