Java Advanced Imaging
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Java Advanced Imaging (JAI) is a Java extension API which provides a set of object-oriented interfaces that support a simple, high-level programming model which lets you manipulate images easily.
JAI is provided as a free download directly from Sun Microsystems for the Windows, Solaris, and Linux platforms. Apple Computer also provideds an OS X version of the API from their website.
While the API is provided in Java it takes advantage of JNI technology on some of platforms to provide native libraries which may provide better performance.