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November 2004
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2004.11.05 19:44 "Re: Support for DNG tags", by Chris Cox
At 11:37 AM +0530 11/5/04, 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. > > > 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? You need to read up on what Camera RAW data is -- it isn't RGB data. The raw sensor data has to go through some pretty extensive processing to get RGB data - that processing is demosaicing. Also, Camera RAW data typically uses lossless JPEG compression. I'm saying that LibTIFF shouldn't be decompressing and demosaicing the Camera RAW data - it's too complex (and not easy to do well). Chris