How to avoid ugly dithering when running KDE over VNC?

How to avoid ugly dithering when running KDE over VNC? I'm currently setting up a new Xen paravirt domain running KDE (4.2.2, from Kubuntu 9.04). As I have been unable to get the virtual framebuffer working in it, I've decided to set up VNC (from the vnc4server package), and run KDE over Xvnc.
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bert [Entry]

"Dithering generally occurs when a color palette of higher depth must be displayed using a color palette of lower depth. For example, rendering a 24-bit color palette (2^24=16M colors) in a 16-bit display (2^16=64K colors) or a 16-bit color palette in a 8-bit display (2^8=256 colors)

Just a shot in the dark, but vncserver has a -depth flag you can specify to change the color depth of the server to match your desired client display settings. I assume vnc4server has a similar flag? It defaults to 16-bit, so I'm wondering if you run your VNC server under 24-bit depth if that would prevent the dithering.

I'm not sure of the performance implications or whether that even matters to you.

There may be other ways to solve your problem, but this is the first thing that comes to mind."