Watermarking images paperclip’s post-processor

Thank you Jonathan.

Works great in development mode. Do you have any idea why it doesn't work in production mode.

I'm running this in production without a hitch. Maybe there's a problem with your deployment set up?

Hi, I made this work. Thanks.
But the only problem is how to tell the processor to do the watermark only on create and not on edit/update?
Right now, everytime I edit the post with option to attach photo, the previous uploaded gets watermarked again!!

If there is no image, it won't process. It should also only process the original, so it shouldn't matter.