[kbs666]

This is supposed to be a feature of existing smart images. I've never had much luck using it.


Load a smart image. From there click the hammer and wrench ico at the top of the topic pane, or press F7, there should be a menu item for Overlay Image -> Load Overlay Image (plus some disabled stuff). The only thing that has ever worked at all for me is a transparent gif the exact same number of pixels and shape of the base image. From there you're on your own. I simply couldn't do anything with it and all my questions to the devs went unanswered.

If you do have any luck making it work please post about it.