I'm trying to perform an image-trace on a bitmap artwork. The vector result will then be cut into glass, and I need to have exactly 60 colors, since we only have 60 colors of glass.

Is there a way to set up Illustrator to image-trace a limited palette of 60 colors? I've found the slider in CS6 that ranges from 2-30, but is there a way to force it to go over that?

Thanks!