Hi i would like to make a grey scale image so i can carve it in a program like photo vcarve. The images i have been looking at are like these



I think its called a relief carving?

I would like to create a relief carving of this



But i dont know how to create a greyscale image of it so i can use it.

Any suggestion on how i could create a carving or is this not possible?

Thanks simon.