It may help, but I think your real problem is that you're picking up the color of the wood that you have the coin on. You may want to try white or black as a background and see what that does.
The "background problem" is actuelly no problem at all if you use a spot metering mode and shoot the coin.Background is taken into account by the camera processor only when shooting in matrix or equivalent modes. The camera can use various areas of the picture to make auto settings.Just try to reduce this area enough to exclude the area which is occupied by the background.Spot metering should do. I don't think I made myself clear, so here you go: http://en.wikipedia.org/wiki/Metering_mode
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