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May 1997
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1997.05.02 09:17 "Re: BIG TIFF file problems", by Bjorn Brox
Hans Christiansen wrote this: > > 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. > WOW! ... > > # tiffcp -s -c lzw a1.tif a1c.tif > a1.tif: Warning, incorrect count for field "StripOffsets" (1, expecting > 111); tag ignored. > This error message is correct, see below: > I have a theory as to why this is happening: > > Looking at a tiffdump of the file: > > # tiffdump a1.tif ... > ImageWidth (256) LONG (4) 1<85640> > ImageLength (257) LONG (4) 1<66133> ... > StripOffsets (273) LONG (4) 1<174> > RowsPerStrip (278) SHORT (3) 1<597> > StripByteCounts (279) LONG (4) 1<707953765> ... > > 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! > The file tells: RowsPerStrip 597. This means that there have to be (ImageLength + ImageLength - 1)/RowsPerStrip StripOffset and StripByteCounts values too, i.e. 111. > I am wondering if anyone agrees with my theory. Well, you migth also get these kinds of errors, but by dividing the file into strips this error can be avoided. > > 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 > -- Bjorn Brox, mailto:brox@corena.no, CORENA A/S, http://www.corena.no/ P.O.Box 1024, Kongsberg Naeringspark, N-3601 Kongsberg, NORWAY Phone: +47 32 73 74 35, Fax: +47 32 73 68 77, Mobile: +47 92 63 85 90