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So, I want to use Blender for motipn graphics, and I previously used Hitfilm Express. One of the most frustrating things in Blender is creating a mask. But how does one do that like in Hitfilm? In Hitfilm, you literally just add a mask in the properties of something, and then thats it. How does one do that in Blender?

And I want to know how do I make the mask transparent without using a color key node (right now to make the mask transparent, on the mix node, I put the background to be green, then I use the color key mode to make it transparent)

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    $\begingroup$ You add a mask node in the node tree and then that's it. $\endgroup$
    – Mzidare
    Commented Sep 1, 2018 at 4:51
  • $\begingroup$ But I cant set the mask to be alpha $\endgroup$
    – lpydawa
    Commented Sep 1, 2018 at 5:08
  • $\begingroup$ @Mzidare i'll edit the question to be more specific $\endgroup$
    – lpydawa
    Commented Sep 1, 2018 at 9:13
  • $\begingroup$ You can use Set Alpha node(In Converters) and as an Alpha input use the mask. You can also use Alpha Over node with Alpha 0 background input and your image "over" input, but that leaves sometimes ugly rim, so the first option is better in most of the cases. $\endgroup$
    – Mzidare
    Commented Sep 1, 2018 at 12:39
  • $\begingroup$ @Mzidare maybe post it as an answer? $\endgroup$
    – lpydawa
    Commented Sep 1, 2018 at 12:43

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You can use Set Alpha node(In Converters) and as an Alpha input use the mask. You can also use Alpha Over node with Alpha 0 background input and your image "over" input, but that leaves sometimes ugly rim, so the first option is better in most of the cases.

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