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IPI Abbrev. for Image Processing and Interchange. A multipart ISO/IEC standard (12087) that provides a model for the representation and manipulation of images in a digital form. Part 1 is a Common Architecture. Part 2 is the Programmer's Imaging Kernel System (IPI-PIKS), which defines processing operations on images. Part 3 is the Image Interchange Facility (IPI-IIF) for interchanging images; the IIF provides functionality for the storage and transfer of images, which can incorporate a wide variety of image structures and compression techniques.