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2008.06.24 07:27 "Extracting raw data from tiff files with different number of rows/strip", by Bogdan Cristea
Can someone explain or point some references for the procedure used to write into TIFF files multiple strips? I try to extract from two TIFF files raw data in order to transmit data using a fax/modem, but the number of bytes is different when extracting data from TIFF files with different number of rows/strip, even if the image in both files is identical. Below it is listed the output of tiffdump for the two TIFF files I use. The second file (with multiple strips) was obtained from the first one (single strip) using tiffcp utility in order to change only the number of rows/strip. Magic: 0x4949 <little-endian> Version: 0x2a <ClassicTIFF> Directory 0: offset 866 (0x362) next 0 (0) ImageWidth (256) SHORT (3) 1<1728> ImageLength (257) SHORT (3) 1<2241> BitsPerSample (258) SHORT (3) 1<1> Compression (259) SHORT (3) 1<4> Photometric (262) SHORT (3) 1<0> FillOrder (266) SHORT (3) 1<2> StripOffsets (273) LONG (4) 1<8> Orientation (274) SHORT (3) 1<1> SamplesPerPixel (277) SHORT (3) 1<1> RowsPerStrip (278) LONG (4) 1<4294967295> StripByteCounts (279) LONG (4) 1<858> XResolution (282) RATIONAL (5) 1<204> YResolution (283) RATIONAL (5) 1<196> PlanarConfig (284) SHORT (3) 1<1> Group4Options (293) LONG (4) 1<0> ResolutionUnit (296) SHORT (3) 1<2> PageNumber (297) SHORT (3) 2<0 1> Software (305) ASCII (2) 9<fax2tiff\0> Magic: 0x4949 <little-endian> Version: 0x2a <ClassicTIFF> Directory 0: offset 15692 (0x3d4c) next 0 (0) ImageWidth (256) SHORT (3) 1<1728> ImageLength (257) SHORT (3) 1<2241> BitsPerSample (258) SHORT (3) 1<1> Compression (259) SHORT (3) 1<4> Photometric (262) SHORT (3) 1<0> FillOrder (266) SHORT (3) 1<2> StripOffsets (273) LONG (4) 2241<8 15 22 29 36 43 50 57 64 71 78 85 92 99 106 113 120 127 134 141 148 155 162 169 ...> Orientation (274) SHORT (3) 1<1> SamplesPerPixel (277) SHORT (3) 1<1> RowsPerStrip (278) SHORT (3) 1<1> StripByteCounts (279) LONG (4) 2241<7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 ...> XResolution (282) RATIONAL (5) 1<204> YResolution (283) RATIONAL (5) 1<196> PlanarConfig (284) SHORT (3) 1<1> Group4Options (293) LONG (4) 1<0> ResolutionUnit (296) SHORT (3) 1<2> PageNumber (297) SHORT (3) 2<0 1> Software (305) ASCII (2) 9<fax2tiff\0> -- Bogdan Cristea