The VG Resource

So I want to rip sprites from an arcade game, I've already got MAME, I practically have the ripping tutorial from this site lodged in the back of my head, but there's one small problem: in the tile viewer, the background is pitch black.

It's not just when I select a certain color palette, either, pretty much every palette in this game's tiles has a black background. "Now, Neon," you might ask. "Why is this an issue?" Well, it's because the sprites in the game I'm wanting to rip from use black as their outline color.

So, yeah, does anyone know how I can work around this?

P.S: The arcade game I'm wanting to rip from is Combatribes.

The way most of us ripped from MAME was we take two shots of the screen: one is for the actual palette, the other is an alternate palette where the black part of the sprite is a different color. Then we use whatever graphics software (with at least layers and the magic wand) we use to select the colors of both shots, invert selection, and change background to something. I still use an old version of MAME so I don't know if a new version is different.