How to pick target texture image for baking? 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?
For Blender internal renderer, the important thing (as I just learned) is to understand Blender assigns textures in the Image Editor on a per face basis. So it's not enough to just load the texture in your UV/Image Editor; you have to load the texture while having the relevant UVs selected also. This way you match the image with the UVs and the image becomes the target for baking.