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RPhoto is a small software aiming at the easy handling of digital camera's photos. (RPhoto is the next generation of IMPhoto). Its origin resides in the lack of a simple software capable of cropping photos with a constant ratio, to avoid white borders when printing. Main features are :

Crop images with a constant width / height ratio (by example 4:3 for numeric photos)
Rotate / Flip photos
Lossless crop / rotate / flip operations.
Available under Linux and Windows.