Systems Deployment

So on my k2000 device I was able to create a OS X Netboot environment from a OS X install, Netboot Server for Mac OS X Clients has been enabled on the K2000, So how do i capture the image, When i boot to Netboot on the mac, I get the globe, process bar, then to admin log in, and just the standard OS that is installed on the Mac boots, not able to capture an image, not sure why, any help would be appreciated