objekt edges are full with steps (OSA 15)

Hi all when im making an test render to see who it looks at this point and i do OSA on 15 there are lots of steps at the edges why? but this isnt at all objekts as you can see. Can it Maybe be couse i have every objekt in another layer and every have an own light just for the layer ? (and yes im totaly new in blender and this is not the nedprodukt it will change really much until its finished ^^)

http://img45.imageshack.us/img45/3104/test9ua.th.gif

the problem is related to your lighting and use of a toon shader

[so the pixels at the very edge of the object have a large change in color, oversampling isn’t catching this properly. I’m sure there’s a workaround but I can’t think of it right now except perhaps full osa on the material options]

If OSA is not good enough, render at a higher resolution and rescale. That should be sufficient.