Reply to thread

Yep, I think that's a good evaluation/epilogue on what this was actually all about Alfie.

(@moderators: feel free to change the subject title, tags, or whatever to make things more clear or useful to others)

While I wouldn't be too concerned about the blacks of the source image being fully black, the whites indeed would better be fully white, so not to put some fog over whatever image you overlay the result of this upon?

I'm fully content with now being able to extract a blackish icon/symbol/glyph/logo or whatever from a b&w (greyscale) image that has a white background (preserving the looks of its gradient borders), but I can imagine that some will want to extend this to extracting such elements from images that are not so clearly b&w, and maybe even full colour.

So, maybe this won't be the end of this thread?  (it could be an interesting subject for black-belts?)

Anywayz, my riddle has been solved. Twice.

Much appreciation to each and everyone that has been replying and contributing.