If we could make a transparency part of a matching template, that would be great.
Right now we can define "ignore" regions manually with a pen tool. But we can't have it import and understand the transparent pixel data and automatically flag those as "ignore" regions. That would be a useful feature.
Now:
Tedious manual editing, sometimes imprecise
Hopefully:
Open file
Option for "Ignore Transparent Areas of Image" perhaps on this dialog:
Done!
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