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Tuesday, September 30, 2008
Motion Quick Tip: Cleaning Up With Crop
Mark Spencer | 09/30
Getting Rid of Those Dirty Edges
When you blur elements in Motion, sometimes your edges can become “tainted” - here’s how to fix them quickly and easily.
Here’s a typical example: you have a nice image that you want to use as a background for your project.

Since it’s a background, you don’t want it to distract from your foreground elements, so you add a Gaussian blur filter and crank it up. But then you notice the edges have become dark.

What’s happening is that the blur filter is not only blurring the image; it’s also blurring the empty black space outside the Canvas, bleeding it into the image. While this can be a nice look in some cases, what do you do if you don’t want it?
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Aha! Good to know. I’m used to that function having a different name, such as Blur Alpha or Repeat Edge Pixels. Thanks!
Posted by Chris Meyer on 09/30 at 08:40 AM
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