I'm trying to bake bump maps into normal maps. I am having problems with the baking process in that it seems to arbitrarily select the image that the bake renders to. Sometimes it bakes to the texture I've created for the normal map, but sometimes it will bake to the diffuse map instead.
I'm not sure what makes the difference. Even when I make sure the normal map image is selected in the UV editor and I've assigned a UV map to the normal texture it still sometimes bakes to the diffuse map.
How can I make sure I bake to the image that I want?