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January 2007
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2007.01.15 15:12 "TiffOpen opens file too long", by Tomasz Bywalec
Hi, 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). Thanks for any reply, Tomasz Bywalec