How in the world - Watermarking

[eluser]Medikal[/eluser]
I've looked at the library, and I still can't figure out how in the world I can produce an image in my view, with text on it from a database value.

My main question is where I store the function to grab the value, where I write it to the picture, and how I display the manipulated picture in the view. No resizing, cropping, nothing, only watermarking a number on an image.

Thank you.