watermark api

Hello,

I'm currently writing a custom module that uses the image module and I would like to use the watermark module too. But apparently the watermark module support what type of images (thumbnail, preview, _original) have to get the watermark but not based on where the image comes from...

As my module is some kind of gallery I would like only images posted by that module to get the watermark. I was wondering if I could enable the watermark module, specify that no image type has to be watermark but call a watermark function from my module to invoke a watermark on the image coming from my module?

I was not looking into the watermark code yet, but I plan to do it soon.

Trogie