Tileset Help

Hey, I'm really sorry if I'm in the wrong section. Really tired and reading is a bit harder than usual.

Anyways, most of the tilesets I am getting have a white grid on it. I'm trying to use DAME to make a map with my tiles, and it doesn't like the white grid. Is there any program that I can use to remove those white lines, or a program like DAME that doesn't mind the white grid.

This isn't the same set I am using, but this is an example of what I mean:

I've had this problem too, I had to line the sprites up in photoshop. Is there any way you can use DAME (I've not actually heard of it!) to export without the margins?