Yes, it is a bit late because I've moved on to a third option that seems to be working even better than either A or B, but your opinion is still valued :)

It's really difficult to imagine what you are describing, Julian. Please can you give us a few screen shots to work with, or the FCW file?

It's good work, Jim :)

Win 10 strikes again!

Excellent! It works. Thanks Joe. I just wish I'd known about that years ago.

I had started to import the symbols, then open the results in GIMP to select alpha and sharpen the mask, fill with black on a new layer, then invert the mask and trim the semi-transparent pixels away before merging the two layers to form one antialiased image with nice clean edges. It takes too long, though, when you are still drawing new symbols on a time limit.

The symbols generated without any kind of antialiasing look rougher at lower resolutions, but at least they don't have those white fringes on them anymore, and I don't have to waste so much time preparing them all by hand now.