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May 1997
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1997.05.02 07:04 "BIG TIFF file problems", by Hans Christiansen
Hello I am having problems with very large tiff files created by our RIP software. The tiff file created is a bilevel tiff comprising of uncompressed data in a single strip!! The size of the file is 707,953,939 bytes. What I want to do is compress this file using lzw, packbits or g4 compression. This is however not possible as I get the following error when trying to convert using tiffcp: # tiffcp -s -c lzw a1.tif a1c.tif a1.tif: Warning, incorrect count for field "StripOffsets" (1, expecting 111); tag ignored. I have a theory as to why this is happening: Looking at a tiffdump of the file: # tiffdump a1.tif a1.tif: Magic: 0x4d4d <big-endian> Version: 0x2a Directory 0: offset 8 (0x8) next 0 (0) SubFileType (254) LONG (4) 1<0> ImageWidth (256) LONG (4) 1<85640> ImageLength (257) LONG (4) 1<66133> BitsPerSample (258) SHORT (3) 1<1> Compression (259) SHORT (3) 1<1> Photometric (262) SHORT (3) 1<0> SamplesPerPixel (277) SHORT (3) 1<1> StripOffsets (273) LONG (4) 1<174> RowsPerStrip (278) SHORT (3) 1<597> StripByteCounts (279) LONG (4) 1<707953765> XResolution (282) RATIONAL (5) 1<2400> YResolution (283) RATIONAL (5) 1<2400> I noticed that the width (85640) multiplied by the height (66133) (=5,663,630,120) exceeds the maximum possible value of the type uint32 which is 4,294,967,295. It is this 'overflow' that causes tiffcp to fail! I am wondering if anyone agrees with my theory. If so, or even if not, is there anybody who can help me solve this problem? Hans Christiansen hans@ljungbergs.se Ljungbergs Tryckeri AB Tel. +46 435 120 40 Box 100 Fax. +46 435 126 35 S-264 22 Klippan Mob. +46 70 518 26 49 Sweden