Open image. Add alpha channel.
Duplicate image.
Select Color - Component-Decompose (RGB, Decompose into layers)
Select whichever appears more white and more black.
(Use color-curves to adjust more black and more white.)
Selected object must be WHITE color, if not do color INVERT.
Edit copy.
Right click Original Layer - Add Layer Mask. (White)
Click on White copy of layer mask, Edit Paste.
(Now you can reduce the opacity to check against original image, if selected object portion is missing, just use erase tool to adjust.
Click Anchor.
Flatten image.
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