Scanning foil is a big huge PITA.
One technique to try is to rotate the card 90 degrees and scan that way, sometimes that helps. Also check out Billy's link on scanning cards to make them look like they do in hand: http://cardboardhistory.blogspot.com/p/how-to-make-your-scans-look-like-cards.html
I collect: Baseball, Football, Hockey, Mostly Vintage pre1980, My Homie teams - Washington/Baltimore Teams Senators (Twins, Rangers), Expos/Nationals, Redskins, Capitals, Bullets/Wizards - HOFers - Non-sport (mostly TV shows and movies).
My Trade List is very much a work in progress
CaptKirk42s Trading Card Blog Curly W Cards Strive For '65 YouTube klandersen42