32 bit vs 16 bit colour

[Business Brian]

I normally have my colours set at 32 bit. Seems to make sense, especially as it's an option for the larger scren sizes.
 
 Had a bit of a shock earlier, though, when I tested a site for 800x600 compatibility - one of the major background images looked pretty awful. I'd forgotten that at 800x600 resolution, you can only use 16 bit - in Windows 98 at least.
 
 You can bet I'm going to be more careful with my graphics in future...