just a tip for that....but i don't think it work yet..but maybe you can use it in the future: in the menu of the layer you have the option for export the selected layer, when you press shift when you click on that, artrage will export 4images.... color, bump, wetness, alpha and so on...didin't know exactly all channels. good for use the maps for a 3d material.

Gn8 everyone..