Understanding Pre-Divide and Post-Multiply in Fusion

If you’re working in Fusion this is a feature you’ll need to understand.

When dealing with combining images and masks, you’ll be dealing with an alpha channel. An alpha channel is a set of simple instructions that tell Fusion what to make transparent.

Some tools may affect that channel, giving you different results than you expected. So knowing how to control it will help you get the image you want much more quickly!

In this video from Casey Faris, you’ll learn about:

  • Basic composite
  • What happens without using Pre-Divide/Post-Multiply
  • RGB channels
  • Alpha channel
  • Applying Pre-Divide/Post-Multiply
  • Using Alpha Divide and Alpha Multiply nodes
  • Order of operations for applying a mask

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