I am assuming your have a card that can do higher that 256 colors. . .
You are probably running XFree86 with a low color depth. Probably 8bpp. You may want to set the default for XFree86 to be at least 16bpp instead, or as high as your card can allow you.
To change your default, you need to edit your XF86Config file, and check whether you have DefaulDepth setup under the "Screen" Section of your file. If not, just add the line Default Depth 16 (or whatever depth you can set higher than 8bpp) to the "Screen" Section. And then re-start XFree86.
Hopefully that will fix it.
GL
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