This adds a watermarking processor to spree product images.
When the image is processed by paperclip, it will also be watermarked
with the watermark images (if it exists) located at public/images/watermarks/
named for the image size (large.png, product.png, small.png, tiny.png).
Add gem 'spree_watermark' to your gem file and place your watermark images
in public/images/watermarks/
NOTE: BY DEFAULT, THIS WILL FORCE ALL OF YOUR ASSETS INTO PNG. YOU WILL NEED TO CUSTOMIZE AS BELOW TO CHANGE THIS BEHAVIOUR.
Override app/models/image_decorator.rb in your main app and plug in your own has_attached_file call.
Copyright (c) 2011 Azimuth Internet Services & Christopher Maujean, released under the New BSD License