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May 2006

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2006.05.25 17:24 "libtiff writes zero valued tile offsets and byte counts", by Thomas Sharpless

2006.05.30 08:42 "Re: libtiff writes zero valued tile offsets and byte counts", by Gerben Vos

2006.05.30 18:04 "Re: libtiff writes zero valued tile offsets and byte counts", by Chris Cox

2006.06.01 03:42 "Re: libtiff writes zero valued tile offsets and byte counts", by Joris Van Damme

2006.06.01 04:09 "Re: libtiff writes zero valued tile offsets and byte counts", by Chris Cox

2006.06.08 22:27 "Re: libtiff writes zero valued tile offsets and byte counts", by Mark R Olin

2006.06.08 23:22 "Re: libtiff writes zero valued tile offsets and byte counts", by Joris Van Damme

2006.06.08 18:44 "Re: libtiff writes zero valued tile offsets and byte counts", by Frank Warmerdam

2006.05.25 17:24 "libtiff writes zero valued tile offsets and byte counts", by Thomas Sharpless

My scanning camera app writes tiled tiff images using libtiff under Win32.
The images are readable by PhotoShop (6.01) but not by PaintShop Pro 7 or 
libtiff itself. The problem seems to be that all the tile offsets and 
bytecounts in the file are zero (their number is correct).  Can anyone tell 
me why?

I creates the file thus:

    ptiff = TIFFOpen(OPFileName, "w");
    if( ptiff ) {
      TIFFSetField( ptiff, TIFFTAG_IMAGEWIDTH, pSC->img_cols );
      TIFFSetField( ptiff, TIFFTAG_IMAGELENGTH, pSC->img_rows );
      TIFFSetField( ptiff, TIFFTAG_COMPRESSION, 1 ); // uncompressed
      TIFFSetField( ptiff, TIFFTAG_PLANARCONFIG, 1 ); // contiguous
      TIFFSetField( ptiff, TIFFTAG_SAMPLESPERPIXEL, pSC->scn_cpp );
      if( pSC->scn_cpp == 1){   // greyscale
        TIFFSetField( ptiff, TIFFTAG_BITSPERSAMPLE, 8 * pSC->img_bpc );
        TIFFSetField( ptiff, TIFFTAG_PHOTOMETRIC, 1 ); // 0 is black
      } else {                  // RGB
        int n = 8 * pSC->img_bpc;
        TIFFSetField( ptiff, TIFFTAG_BITSPERSAMPLE, n, n, n );
        TIFFSetField( ptiff, TIFFTAG_PHOTOMETRIC, 2 ); // RGB
      }
    // tile size
      TIFFSetField( ptiff, TIFFTAG_TILELENGTH, pTB->getHgt() );
      TIFFSetField( ptiff, TIFFTAG_TILEWIDTH, pTB->getWid() );
    // verify
      if (!TIFFCheckTile(ptiff, 0,0,0,0)) fail();

write each tile thus:

     if( TIFFWriteTile( ptiff, pdata, imgx, imgy, 0, 0 ) < 1 ) fail();

and call TIFFclose( ptiff ) at the end.