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Mask Images

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  • Posts: 1
  • Joined: Sun Mar 14, 2021 1:10 am
  • Real Name: Johannes Stieler

Mask Images

PostSun Mar 14, 2021 1:42 am

I'm new in Fusion and having a lot of trouble with masking images in Fusion.
Somehow my issues are so strange, that I don't even know if I'm doing something wrong, or is it a bug in fusion.
However, I'm trying to mask a large image (PNG File). The Mask also is a PNG-File with transparency.
The channel of the Image that has to be masked is set to "Alpha".
I connect the nodes, and the mask work, but somehow the larger the masked image is, the less I can see of it (see image1 below).
In other words: it looks like part of the masked image is cropped away.
Now what I find interesting is, that inverting the mask works without any problems(see image2 below).

How can I fix this problem?
inverted.png (672.75 KiB) Viewed 212 times
masked.png (200.17 KiB) Viewed 212 times


  • Posts: 1801
  • Joined: Mon Apr 23, 2018 5:21 am
  • Real Name: Eric Eisenmann

Re: Mask Images

PostMon Mar 15, 2021 6:14 pm

I would try merging your image you are using as the mask with a Background node with its alpha turned to zero so it's transparent. Make sure the Background node is the same dimensions as your MediaIn3 of your example.
2021-03-15 (8).png
2021-03-15 (8).png (269.11 KiB) Viewed 186 times
2021-03-15 (9).png
2021-03-15 (9).png (323.43 KiB) Viewed 186 times
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