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I have this image:
I want to whiten out everything around the thicker stroked large circle.
I would just use a background image with a cutout but the size of this structure changes so that won't work.
I would just make a few thick stroked white circles with no fill incrementing larger w/h than the thick circle there, but as the circle size changes, the stroke weights and spacings have to be carefully adjusted to match.
Is there a more solid (pun intended) for this?