So, addHook automagically add the method to the pageImage object.
I thought hooks where a defined set (like render, save and so on...).
I was blown away by the power of PW as CMF, but i'm on the way to get blown away by the power of module development!
I considered client side generation of the image, with css or a js/canvas solution, but integrating the functionality in PW just has that The Right Way™ feeling.
Also, i need to show 70+ images per page and this could be too much for the client side.
Thank you so much, this is often regarded as a vibrant and helping community, now i can confirm that!