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2006.09.20 17:20 "TIFF file bigger than 2Go", by <dlpnet@free.fr>
Hello all, I have problems creating TIFF file bigger thant 2 Go, or more precisely I cannot read this kind of file with any viewer I find : Photoshop, Irfan, ImageMagick, ... So, I m using libtiff3.7.0 and I also tried libtiff3.8.2 with the same problem. So I m using these headers: TIFFSetField(m_pstripFile, TIFFTAG_IMAGEWIDTH, width); TIFFSetField(m_pstripFile, TIFFTAG_IMAGELENGTH, height); TIFFSetField(m_pstripFile, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT); TIFFSetField(m_pstripFile, TIFFTAG_SAMPLESPERPIXEL, spp); TIFFSetField(m_pstripFile, TIFFTAG_BITSPERSAMPLE, bps); TIFFSetField(m_pstripFile, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG); TIFFSetField(m_pstripFile, TIFFTAG_PHOTOMETRIC, photometric); TIFFSetField(m_pstripFile, TIFFTAG_COMPRESSION, comp); And I write each line with: TIFFWriteScanline(out, (void *)buf, cbY, 0); with 'out' the file pointer, 'buf' the buffer of the line and 'cbY' the line number (uint32). Everything seems to be correctly written and I can produce for example a 2,4Go TIFF file. But I cannot open them in any software. I add that any other file smaller than 2Go can be opened without any problem. So my questions are: - is it normal ? I thought the limit of a tiff file is 4Go. - do I have to set other parameters to allow the creation of bigger files than 2Go ? - if I look at the resulting tiff file, I can see that the IFD area is at the end of the file. Can this be the problem ? That the software cannot seek to the end of the file to read the IFD header ? Is it a way to tell the libtiff to create the IFD header at the *beginning* of the file ? Thanks for your help ! Dlp