rdesktop colors

[monkymind]

Is it possible to increase the amount of colors to more than the 256 displayed via rdesktop? The server is running Windows 2003.

Did you have a look at the man pages? ie man rdesktop

-a <bpp>    
Sets the colour depth for the connection (8, 15, 16 or 24).  More than 8 bpp are only supported when connecting to Windows XP (up to 16  bpp)  or newer.   
Note  that  the  colour depth may also be limited by the server
configuration.

Cheers
rob