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Question: Resize image masks

It's obviously possible to move (offset) the image mask around, but such a trivial thing as resizing it seems to be unavailable in FCP 10.4, unless I'm missing something painfully obvious?


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The only solution appears to be to resize the mask in an external editor, guesstimating a right size, try it on, then repeat until you're happy or sick of it. This seems like a bit of a head-scratcher.


Plus, I can only choose an image mask from among the clips in the browser, which means I need to import the mask every time, which for me doesn't work unless I restart FCP. Importing the same image again doesn't have any effect, either using Cmd-I or using drag and drop from Finder, unless I restart FCP.


Something as patently simple as masking a clip with an image literally takes a couple of hours.


Does anyone have a solution?

Final Cut Pro X, macOS High Sierra (10.13.3)

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Try using silhouette alpha. Combine the video and the mask into a compound clip above the background. By far the best way to do this.

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Mar 5, 2018 6:31 AM in response to Tom Wolsky In response to Tom Wolsky

I'm simply masking a video with a transparent PNG using its alpha channel.


I'll try to add the mask on the Timeline and test some blend modes, thanks for the suggestion.


I still find it odd that the image mask (in the Masking effect) can be translated but not resized (not even mention cropped, rotated etc.)

Mar 5, 2018 6:31 AM

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Mar 5, 2018 6:41 AM in response to Tom Wolsky In response to Tom Wolsky

I've tried that, and no blend mode worked.


Here's what I want: I have a background layer, and a foreground layer, which is a smaller video.


I want to mask the edges of the smaller (foreground) video so, instead of being rectangular, they appear to be jagged; the background layer thus "protrudes" into the foreground video.


This works great with the Masking effect, and I have my jagged PNG, but the scale isn't right.


I can't get it to work by adding the PNG into the Timeline and fiddling with blend modes, because I can't make it affect both of the other layers at the same time.

Mar 5, 2018 6:41 AM

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Question: Resize image masks