This is a displacement map. It is basically an overlay of one image onto another. the top picture is fitted to the contures of the underlying image which is a babies face.
This is a tabloid sized image of my thumb print. I took this photo and uploaded onto the computer. I scaled it up in a tabloid sized job so that you can easily see the print.
This is my astro image. it is two photos from outer space layed over one another and the top photos opacity has been changed so that both photos show up.