When I take an image in the compositor and scale it up 2x or whatever and then separate the RGBA and dilate/erode the alpha and use that to set the alpha on the image, it only works within the size of the original image and not the scaled up image.
Am I doing something wrong? Is this a bug? Is there a work around?
My node setup:
Crop when using dilate/erode:
How it looks without the crop:
Example Blend file for blender 2.79 (also happens in 2.8 though)
dilatecropissue.blend (521.7 KB)
EDIT: Filed Bug report