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September 1994
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1994.09.22 14:48 "Re: TIFF CIEL*a*b* Question (with Answer)", by Craig Jackson
Karsten Spang <krs@kampsax.dk> writes: >In message <9409200753.AA10921@kalle.ivab.se> , >Fredrik Lundh <fredrik@kalle.teragon.ivab.se> writes: > >>But don't ship such files outside your office... When using >>Compression=3 or 4, I'd stick to SamplesPerPixel=1, >>PhotometricInterpretation=0, and RowsPerStrip=ImageLength! > +++++++++++++++++++++++++ >WHAT? You can't be serious! What if your ImageLength and ImageWidth is >10000, 20000, or more? For G3 compression you should stick to the "8k" rule >for RowsPerStrip. For G4 this may ruin your compression rate; if you have >only one or two scan lines in a strip, 2D compression does not make much >sense, in this case you should be more lax about the "8k" rule, and use >at least (say) 100 scan lines per strip. If you're merely using G3 or G4 as a handy compression scheme, you can set RowsPerStrip to whatever you want. However, Fredrik Lundh was absolutely right: if you want to achieve interchange, set RowsPerStrip=ImageLength. Many programs treat the FAX data as FAX data, not just as some portion of a TIFF file. This especially true when translating to and from other file formats. And of course, FAX applications want to see a FAX image, and they know nothing of RowsPerStrip. Craig Jackson craigj@epub.ziff.com Electronic Publishing, Information Access Company