>>2149251The original still existed in IMT 343. Most of the background was white. I zoomed in and went around the rest with a white pencil at a constant distance. Just a matter of practice. If you cut too much, you just undo.
For
>>2148973, one way would be to select everything _inside_ the outline and then expand and feather the selection a number of pixels. Invert and erase the background.
I started
>>2148973 but the pre-existing flaws made it too much work.