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May 2001

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2001.05.12 23:08 "TIFF/CCITT Group 4 Compression uses LZW??", by Wes Rishel

2001.05.13 09:23 "Re: TIFF/CCITT Group 4 Compression uses LZW??", by Andreas R Kleinert

2001.05.13 14:54 "Re: TIFF/CCITT Group 4 Compression uses LZW??", by Frank Warmerdam

2001.05.13 09:23 "Re: TIFF/CCITT Group 4 Compression uses LZW??", by Andreas R Kleinert

> I am a bit surprised find that Group 4 compression would use LZW or be
> reliant on any patented algorithm. Does anyone know if that is, indeed the
> case? Or is it more likely that the error message is incorrect, perhaps
> triggered by the unknown field identified by tiffinfo?

Group4 has compression code 4, while LZW has code 5.
Maybe some wrong check was applied somewhere.