Rough color gradient transitions using 24-bit color

I just started playing around with gradient background shading in GNOME and noticed that almost any color combination has very rough, obvious transitions between shades. This is not the case when using this hardware on Windows. I'm using 24-bit color depth with an LCD flat panel. Has anyone else noticed this (i.e. could it be that GNOME uses a large step between shades when computing the colors for the gradient) or could it be config or otherwise my fault?

For more info, see :
http://social.technet.microsoft.com/Forums/en-US/winserverTS/thread/63b5e03d-f24e-49ab-b0fe-2b6a0cad7534/
and
http://download.microsoft.com/download/4/d/9/4d9ae285-3431-4335-a86e-969e7a146d1b/RDP_Performance_WhitePaper.docx
It seems that 24 is not supported anymore and that we need a rdp version 6 client ( instead
of 5.2 ) to upgrade to 32 bit.
We have the same problem that we need 24 bit for a medical imaging application, and we
will stick to windows server 2003 until a new uttsc version is released.

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