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July 2007
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2007.07.03 15:43 "Re: Big TIFF Sample Files", by Stephen Carlsen
Thanks for the catch! I'll look into it. At 2:15 PM +0200 7/3/07, Joris wrote: >Stephen, > >Joris wrote: >>sc42business@mac.com wrote: >>> I posted a couple of what I hope are valid Big TIFF files, created >>> by a piece of software that is not LibTIFF, as my offering to the >>> gods of interchange happiness. http://tiff2.com/ Regards, >> >>The gods of interchange are reasonably pleased. The files decode fine >>with AsTiff (my own proprietary TIFF codec), and LibTiff 4.0 (the >>BigTIFF upgrade of LibTiff that is almost ready). >> >>The only problem with these files, unrelated to BigTIFF, is their >>tile width of 500 and tile length of 1, both which is not a multiple >>of 16 as tile sizes should be. Seeing image width is 500, you could >>do strips instead and that would leave you with perfectly legit files >>without changing the way they're chopped. > >I should also have mentioned there is also trouble with the EXIF directory, >even in the source image. My software stops reading that directory in the >source image because the tag count is something like over 50.000 or so, and >so makes no sense at all. But it may be the offset that is burzurk or just >copied as LONG value 8 from some source where it used to make sense as IFD >offset. > >In the BigTIFF files, the EXIF tag of the single image IFD has the long >value 8. The BigTIFF header being over 8 bytes long, the value is clearly >wrong already, even before any attempt at reading that EXIF IFD. > > >Best regards, > >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