How can I change BPP (bits per pixel) in KDE?

[Robert Tilley]

I began working in KolourPaint and received the message that colors may not 
display correctly and that I needed to go to more than 24bpp.

I'm running on a 1280x1024 LCD monitor.  How can I fix the above warning?

Thanks,
  Clueless on the 'net, Bob
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