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September 2007
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2007.09.24 08:58 "Re: G3 fax: EOL needed at the beginning of each strip?", by Andy Cave
Well there you have the specifics. Section 10 is for CCITT Huffman, so I would say that Huffman's can (should) not contain EOLs, but G3/G4s should. ----- Original Message ----- From: "ComSquare Martin Osieka" <martin.osieka@comsquare.ch> To: "Andy Cave" <andy.cave@hamillroad.com> Cc: "Joris" <joris.at.lebbeke@skynet.be>; <tiff@lists.maptools.org> Sent: Monday, September 24, 2007 9:52 AM Subject: Re: [Tiff] G3 fax: EOL needed at the beginning of each strip? >> I'm curious - where in the spec does it indicate strips have to start >> with > > You may interpret this from TIFF 6.0 section 11 "CCITT Bilevel Encoding" > > Strips and Tiles. > When CCITT bi-level encoding is employed, interaction with > stripping (Section 3) and tiling (Section 15) is as follows: > a. Decompose the image into segments-individual pixel arrays > representing > the desired strip or tile configuration. The CCITT encoding > procedures are > applied most flexibly if the segments each have a multiple of 4 > lines. > b. Individually encode each segment according to the specified CCITT > bilevel > encoding, as if each segment is a separate raster-graphic image. > > Means strips should be encoded independent from each other. > I do not have access to the CCITT spec in the moment, but I guess they are > telling an image must start with EOL. > > Still section 10 tells no EOLs needed... > So I would expect T.4 TIFFs containing no EOLs at all are legal. > > Martin > ...