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March 2009
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2009.03.16 10:54 "Re: Needs help on implementing the JPEG 7 compression", by Gerben Vos
Sanjeev Balachander wrote: > I have a requirement where in i had to incorporate the JPEG 7 > compression. When i searched in the net i am getting an algorithm for > only JPEG 6 . I am in need of some sample c code for implementin the > JPEG 7 compression to the TIFF images. If some one is having kindly > do share the same if possible. Interesting! Where did you find the algorithm for compression type 6 (old-style JPEG-in-TIFF)? C code for compression type 7 (new-style JPEG-in-TIFF) has been available for a long time as part of libtiff. Just download it from http://www.remotesensing.com/libtiff/ . The code is in tif_jpeg.c . A specification of compression type 7 can be found at http://www.remotesensing.org/libtiff/TIFFTechNote2.html This document also explains why it is a terribly bad idea to try to implement compression type 6. Libtiff contains read-only code for this deprecated compression type. Gerben Vos.