Importing an image and creating a parametric surface

Hello fellow Comsolers...

It's been a while since I have been on here, but I am back!

I am having quite a basic problem with creating a parametric surface from an image.

I create a global definition which is my image (at the moment I am doing a very basic image which is a white square with a black smaller square in the middle). I import the image and when I plot it, I can see that the image is coming into Comsol without any problems.

However, when I try to create a parametric surface I get confused and I'm not too sure what each of the parameters means.

Does anyone here have a working image to parametric surface example I could have a look at please? It can be very basic or more complicated. I would just like to see the image to parametric surface feature working.

Thanks very much for the help,

Rob