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November 2004
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2004.11.05 14:30 "Re: Support for DNG tags", by Bob Friesenhahn
On Fri, 5 Nov 2004, Sachin Garg wrote: > On Thu, 04 Nov 2004 08:58:00 -0800, Chris Cox <ccox@adobe.com> wrote: > > At 5:03 PM +0530 11/4/04, Sachin Garg wrote: > > > I wish to support DNG images in my application and am currently using > > > libtiff for tiff files. I recall a recent discussion regarding support > > > of DNG tags in libtiff. > > > > > > It will be great if libtiff can support DNG images too. Are there any > > > plans to add DNG tags to libtiff anytime soon? > > > > LibTIFF could read the tags > > Yeah, I read that DNG is also TIFF based and libTIFF can support it. I > am just curious if there are any plans to do so anytime soon. Libtiff can already be used to support DNG. Libtiff can include updates (tag definitions) to make this more convenient. I have heard discussion among the libtiff developers about supporting DNG tags. > > But I don't think libTIFF should try to > > decode (demosaic) the camera RAW data. > > I couldnt get what you mean by this. Do mean that libTIFF _should_ > ignore some specific tags? Raster images are all about pixels. The camera RAW data requires some advanced knowledge and processing before it may be used as normal raster pixels. Even when libtiff "supports" DNG, the vast majority of the heavy lifting will be up to the application since libtiff is not going to translate the RAW data into pixels. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us http://www.simplesystems.org/users/bfriesen