Trying to get a signature without that ugly white background bleed through? How do they do that?
Rule # one? Don't delete the background color. Throw out the whole background. Including the signature.
Photoshop easy signature tutorial

So you can go from the original to whatever without a problem in seconds.
These below are ALL THE SAME transparent image, placed on different colored backgrounds.

.original whiteBlack and whiteRedWhatever
Now this "blob" was "placed" on this rainbow. NOT drawn on it!
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