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January 2001

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2001.01.12 21:48 "What is the proper number of bytes in a TIFF 6.0 "word"", by Dave Abercrombie
2001.01.12 22:21 "Re: What is the proper number of bytes in a TIFF 6.0 "word"", by Helge Blischke
2001.01.12 22:52 "Re: What is the proper number of bytes in a TIFF 6.0 "word"", by Dave Abercrombie
2001.01.13 01:04 "Re: What is the proper number of bytes in a TIFF 6.0 "word"", by Tom Lane
2001.01.14 18:54 "Re: What is the proper number of bytes in a TIFF 6.0 "word"", by Andreas R Kleinert

2001.01.13 01:04 "Re: What is the proper number of bytes in a TIFF 6.0 "word"", by Tom Lane

Helge Blischke <H.Blischke@srz-berlin.de> writes:
> If you look at figure 1 (page 14 of the spec), I think it is clear that
> a "word" is meant to be a 2 byte quantity, though the spec doesn't define 
> this term.

Clearer evidence is had from the text defining an IFD entry (at the
top of page 15, in my copy of 6.0):

"The Value is expected to begin on a word boundary; the corresponding
Value Offset will thus be an even number."

If it meant 4-byte alignment, it would say "will thus be divisible
by four".

I agree that the terminology is now a bit dated, but I don't see how
you can possibly read this part of the spec any other way.  "Even
number" is a well-defined term in my part of the world.

Years ago I made a list of a bunch of wording improvements I was
intending to propose for TIFF 7.0, and I think this "word" business was
one of them.  Too bad we (the TAC) never got a chance to have any input
on a 7.0 ...

			regards, tom lane