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From: giant@lindy.Stanford.EDU (Buc Richards)
Newsgroups: comp.sys.next
Subject: Unsupported TIFF question
Message-ID: <9865@lindy.Stanford.EDU>
Date: 6 Jun 90 22:48:57 GMT
Sender: giant@lindy.Stanford.EDU (Buc Richards)
Reply-To: giant@lindy.Stanford.EDU (Buc Richards)
Organization: Stanford University
Lines: 17

Many of the TIFF files stored on the NeXT library, particularly those
in the Webster Dictionary pictures file, appear to have a non-standard
TIFF format.  In particular, the Compression tag field has the value
32766 (7ffe hex), although the only legal values listed in the
Version 5.0 TIFF description are 1, 2, 5, and 32773.  I suppose that
this is a special NeXT extension appropriate for compressing 2-bit
gray-scale images.  I also imagine that this is the reason that the
Icon app refuses to open such tiff files, claiming that they are
"Unsupported TIFF".  

Can I get a description of this TIFF extension and the associated
compression scheme?

Thanks.

	Buc Richards
	AIR
	Stanford University