The way to increase your color depth in X is to add a line to
/etc/X11/XF86Config:

        DefaultColorDepth <bpp>

This line goes in the "Display" subsection of the "Screen" section for
your X server (I think- just put it by the list of resolutions, wherever 
that is).

<bpp> is the color depth you want in Bits Per Pixel (8, 16, 24, or
32).
     -Matt

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