People who use Photoshop use Frequency Separation to achieve a clean background (i.e. remove shoe marks) from the background sweep.
Is there an efficient way to do this in Pixelmator Pro?
Best way to Remove Dirt from Background?
2022-06-25 12:31:16
In this case I´d quick select (Q) the background - copy&paste to make the selection a new layer on top and add Gaussian blur to it:
2022-06-27 00:06:44
Glad it worked out for you.
2022-07-03 12:20:31
Nope - when the selection went into a new layer and "Preserve Transparency" is enabled as pointed out above.