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April 2006
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2006.04.11 10:12 "Re: application supplied JPEGTables", by Joris Van Damme
Gerben, Gerben Vos wrote: > > Meanwhile, why are you refering to a pseudo tag? Would it not > > suit these needs, if the actual JpegTables tag can be set, > > and when next LibJpeg is used to compress, in this case, the > > application supplied tables that are set in this tag are used? > > Yes, that could also be an idea. But I suppose you will either have > to a) parse the tables out from the tag yourself, or b) create a > temporary libjpeg decompression object to do that parsing, and then > copy the tables into the libjpeg compression object. Neither seems > very elegant to me. > > But I'm not going to implement this, and I'm not very much into the > libtiff internals when it comes to JPEG compression, so your ideas > are probably worth more than mine. I think there may be a better solution, but I'm not sure... I'm not even completely sure what current state of tif_jpeg is in this regard. I'll look into it shortly, and report back to the list. Joris Van Damme info@awaresystems.be http://www.awaresystems.be/ Download your free TIFF tag viewer for windows here: http://www.awaresystems.be/imaging/tiff/astifftagviewer.html