VIPS is an open source image processing library which has evolved from many EU projects on imaging. It is designed for speed, automatic multithreading and ease of programming. Its NIP GUI provides a spreadsheet-like interface with its own functional language for scripting. It has a wide develop/user community around the world and runs on almost any platform (using C/C++/Python). It has been used for mosaicing images, dealing with multi-GB images and colour calibration.