Most put a checker board on there mesh to test it.

example
http://www.pixologic.com/zbrush/features/UV-Master/

zBrush has
512x512 ,1024x1024 ,2048x2048 ,4096x4096

zBrush does not have
8192x8192

============================================================ 

The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance