This works, it just takes awhile to isolate images…. If you make a small mistake, you can’t just undo the last change you made. I could do this on a previous app I used that is no longer available, and it was very helpful. On this app you have to keep toggling between add and erase. If you accidentally press on the centre part instead of add or erase, the entire image disappears and you have to start all over again.
You can’t adjust the space between the eraser and where your finger guides it (which is also very helpful), so you often can’t see what you’re doing because your finger is in the way.
So this does work, it just takes some time.
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