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December 2004
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2004.12.18 14:50 "Re: JPEG2000 and Metadata", by Joris Van Damme
> JPEG2000 has a similar number of options as TIFF itself. Jasper > provides a simplified view/set of JPEG2000 capabities yet there are > still many options which would not be exposed by the existing set of > libtiff options. For example, Jasper provides a compression ratio > option which I don't believe there is a direct correlation to in TIFF. Same goes for the quality setting of jpeg compression with LibJpeg, and from the top of my head but unchecked, same goes for some settings of flate compression with ZLib. LibTiff invented the concept of 'pseudo-tag' to set compression-method specific options that are not encoded in any tag. TIFF is a file format specifically aimed at being a container for whatever raster specification and compression method. Saying a particular compression method is best suited by its dedicated container format instead of TIFF, goes against the spirit of TIFF, and is somehow a very weird statement to make in this list. Identifying the options we have and coming up with a TechNote for JPEG2000 in TIFF, instead, would be compatible with the spirit of TIFF. 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