How to get normal/displacement/ao maps for a part of a photo So I used a tool to create maps from a photo, turned out that the map of a cut out shape of the photo completes itself with the rest of the photo.

This is very bad, is there another way to get maps for a part of a photo?

Just the photo:



Normal map from it:



The cut out shape:



The normal map of the shape with autocompleted parts and a strange border on top:



An example with another shape which I only imported like this:



Its normal map is as it should be:
This shouldn't bother you much, since you probably have the original cut image, with all the removed parts transparent (?)

In that case you can use the alpha to either make a mask / selection and remove the useless bits from the generated maps in photoshop / gimp,

Or you can use the alpha from the cut color map in color mix nodes in the node editor. Either way it won't have any effect.