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January 2007
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2007.01.15 15:42 "Re: TiffOpen opens file too long", by Joris Van Damme
Tomasz, Tomasz Bywalec wrote: > I compiled libTiff 3.8.2 library for PocketPC platform, using Visual > C++ 2005 compiler (with optimalization turned on). I use it to open > quite large (about 12000x8000) black-and-white images. I noticed that > TiffOpen spends about 2 seconds just opening the file and reading > it's directory (reading and decoding stripes is much faster, so I > think that it's not because of slow I/O or something like that). With > option 'h' (read header only), TiffOpen returns almost immediately, > so I suppose that it spends so much time on reading file's first > directory. And here's my question - is it possible to speed up the > execution of TiffOpen (including: opening the file and reading it's > directory), in that case ? > > Just in case - images, which my program reads, are usually divided in > stripes, each having height of about 30 pixels (so file consists of > few hundred stripes). Is it possible there are huge tags in there? Can you show us a tiffdump, tagdump, tag viewer dump, or anything that would allow us to correlate the problem with the particular TIFF features? 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