That is very different than I first thought.  I will have to think of that. 

A great cheap paint program that has canvas surfaces is ArtRage.  There is a free version and a $20 version.  You may be able to import the image and apply the canvas surface.  Images can also be exported to .psd format.

“Music is harmony, harmony is perfection, perfection is our dream, and our dream is heaven”
Henri Frederic Amiel