Upgrading GD from 1.6 to 2.0

[Wien]

Hello everybody,

I'm about to upgrade GD from 1.6 to 2.0, and i'd like to know if there is any problem or things to do related to that upgrade.

I'm running PHP 4.1.2 and everything works fine now with GD 1.6, but I need a true color support that's why I need GD 2.0

Thanks
Wien