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August 05, 2009
J2i files speed up the delivery of JPEG 2000 files.
J2i files are an "index" of the JPEG 2000 file. Indexes of JPEG 2000 files can be many hundreds of megabytes in size. J2i files are automatically created by Image Web Server and used to speed up decoding and lower the memory overhead.
Without the J2i file, the application would have to keep a copy of the index table in memory. Indexes are stored as offsets and are expensive to calculate, as well as "expensive" to store when considering the size of available RAM memory.
In this way IWS can have many more JPEG 2000 files open simultaneously (e.g. thousands) than would otherwise be possible. This makes IWS infinitely more scalable than other JPEG 2000 serving solutions.
No matter how fast and powerful computers become, you always need to do what is necessary to delivery efficiency.
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