AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2007.01.15 15:12 "[Tiff] TiffOpen opens file too long", by Tomasz Bywalec
2007.01.15 15:42 "Re: [Tiff] TiffOpen opens file too long", by Joris
2007.01.15 16:06 "Re: [Tiff] TiffOpen opens file too long", by Tomasz Bywalec
2007.01.15 17:56 "Re: [Tiff] TiffOpen opens file too long", by Joris
2007.01.16 00:39 "Re: [Tiff] TiffOpen opens file too long", by Tomasz Bywalec
2007.01.16 12:27 "Re: [Tiff] TiffOpen opens file too long", by Mateusz Loskot

2007.01.15 15:12 "[Tiff] 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