Ibsh, would you consider doing a version of the images without the black background?
I did take a look after the last time it was discussed on thread, but it's a bit of a ball-ache to be honest. It's just not how I prepped the tiles. So you end up with funny black bits all over the place, which are hard to deal with elegantly.
You could use the colour-select tool in PS or GIMP or whatever to select (and delete) any contiguous areas of pure black; it would screw up the text though.