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March 1998
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1998.03.13 21:38 "Re: 6.0 JPEG Support", by James Palo
At 02:15 PM 3/13/98 -0500, Raymond Lieb wrote: >Forgive me if this questions has been asked and answered, but I just joined >the list. (I also checked the archives, but the latest message is dated >January 1995.) > >I need to read TIFF files that were created using the 6.0 JPEG spec. >(compression type 6) Is there a source file that supports this? > >Thanks > > >----- >Raymond Lieb >Legato Software Corporation >rlieb@legatosoft.com > > > You need to check the embeded flag. There are 2 versions of jpeg in a .tif file. If embeded then you can call the Independant Jpeg group code as a whole once you get the start of the data stream. Embeded jpegs are full Ansi Baseline Jpeg images contained in a .tif file. If the embeded flag is not set then you will need to parse the Huffman, and quantization tables out from their own tags. The data stream is a standard compressed jpeg data. This format requires knowledge of tiff and jpeg formats. Jim Palo Snowbound Software Palo@Snowbnd.com