ZBrushCentral

Memory Error

hello.

my problem is that when i try to “Create Normal map” Zbrush comes with an error message saying that i dont have enough memory. its and 4k map

my specs are.
intel i7
8gb ram
ATI Radeon HD 5750 with 1GB

isn’t that enough?

i know that there a many of these threads but i am working on a Mac so all the solutions i found was not of use to me.