It took me some hours, but i finally managed to have attachment_fu
running with image_science - that's an achievement for me 
I have a
few questions about how to use it properly:
1. In the attachment_fu readme, it says :resize_to # Used by RMagick to resize images. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â # Pass either an array of width/height, or a geometry string.
What happens here when you have image_science instead of rmagick? can i give image_science exactly the same options and the same geometry strings? and where can i find some more info about these geometry strings?
2. What is a proper way of implementing an image into another model? For example, i'd like to have something like user.avatar. should i put has_one :avatar into the user-model? (and the has_attachment and validates_as_attachment in the avatar-model?)