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July 2007
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2007.07.03 12:15 "Re: Big TIFF Sample Files", by Joris Van Damme
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