I masked an image in the UV/Image editor masking section. I then used that mask in the compositor for background replacement. However, the mask size seems to be different. Why is that? Here's a screenshot: enter image description here

  • 2
    $\begingroup$ On the dimensions controls, the resolution size is set up at 50%, bring that up to 100% or add a distort-scale node after the mask and before the alpha over and set it to render size. $\endgroup$
    – user1853
    May 6, 2015 at 18:59
  • $\begingroup$ That was part of it. The ratio was also off. $\endgroup$
    – AaronF
    May 6, 2015 at 19:01

1 Answer 1


The reason seems to be that the render resolution didn't match up with the image size.


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