AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

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2007.07.03 18:37 "[Tiff] BigTIFF extension?", by Phil Harvey
2007.07.03 19:04 "Re: [Tiff] BigTIFF extension?", by Stephen Carlsen
2007.07.03 19:09 "Re: [Tiff] BigTIFF extension?", by Bob Friesenhahn
2007.07.04 15:58 "Re: [Tiff] BigTIFF extension?", by Phil Harvey
2007.07.04 11:37 "Re: [Tiff] BigTIFF extension?", by Phil Harvey
2007.07.04 15:16 "Re: [Tiff] BigTIFF extension?", by Bob Friesenhahn
2007.07.04 17:13 "[Tiff] 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
2007.07.04 17:24 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
2007.07.04 17:26 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
2007.07.04 17:49 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
2007.07.04 18:00 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Joris Van Damme
2007.07.04 18:59 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Bob Friesenhahn
2007.07.04 20:37 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
2007.07.04 21:40 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
2007.07.05 10:56 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andrey Kiselev
2007.07.05 12:03 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
2007.07.05 12:57 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andrey Kiselev
2007.07.05 13:45 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Joris Van Damme
2007.07.05 14:26 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andrey Kiselev
2007.07.05 16:02 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Bob Friesenhahn
2007.07.05 16:30 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Joris Van Damme
2007.07.05 15:08 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
2007.07.05 16:02 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andrey Kiselev
2007.07.05 16:56 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andy Cave
2007.07.05 17:58 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
2007.07.04 18:02 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Joris Van Damme
2007.07.05 18:30 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Joris Van Damme
2007.07.05 19:29 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
2007.07.06 01:46 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Chris Cox
2007.07.09 15:35 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andrey Kiselev
2007.07.09 20:13 "RE: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Chris Cox
2007.07.10 07:29 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andrey Kiselev
2007.07.10 18:54 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Chris Cox
2007.07.04 17:28 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Michael Wolf
2007.07.04 18:02 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Stephen Carlsen
2007.07.04 17:36 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andrew Brooks
2007.07.03 19:17 "Re: [Tiff] BigTIFF extension?", by Andy Cave
2007.07.04 11:53 "Re: [Tiff] BigTIFF extension?", by Phil Harvey
2007.07.04 20:52 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
2007.07.04 21:04 "Re: [Tiff] BigTIFF extension", by Toby Thain
2007.07.05 05:07 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
2007.07.05 08:09 "Re: [Tiff] BigTIFF extension", by Andy Cave
2007.07.05 13:40 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
2007.07.05 21:00 "Re: [Tiff] BigTIFF extension", by Chris Cox
2007.07.05 21:19 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
2007.07.05 22:13 "Re: [Tiff] BigTIFF extension", by Bob Friesenhahn
2007.08.06 22:48 "RE: [Tiff] Transparency ... associated or unassociated alpha is morecompatible?", by Chris Cox
2007.08.06 22:32 "RE: [Tiff] Transparency ... associated or unassociated alpha is morecompatible?", by Chris Cox
2007.08.06 22:08 "[Tiff] Transparency ... associated or unassociated alpha is more compatible?", by William Gallafent
2007.08.06 22:27 "Re: [Tiff] Transparency ... associated or unassociated alpha is more compatible?", by Bob Friesenhahn
2007.08.06 22:28 "RE: [Tiff] Transparency ... associated or unassociated alpha is morecompatible?", by Chris Cox
2007.08.06 22:48 "RE: [Tiff] Transparency ... associated or unassociated alpha is morecompatible?", by Bob Friesenhahn
2007.07.06 12:36 "Re: [Tiff] BigTIFF extension", by Gary McGath
2007.07.09 14:10 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
2007.07.09 15:11 "Re: [Tiff] BigTIFF extension", by Toby Thain
2007.07.05 16:26 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
2007.07.05 04:19 "RE: [Tiff] BigTIFF extension", by Kemp Watson
2007.07.04 16:56 "[Tiff] BigTIFF extension", by Kemp Watson
2007.07.04 17:35 "Re: [Tiff] BigTIFF extension", by Andrew Brooks
2007.07.04 18:13 "Re: [Tiff] BigTIFF extension", by John Aldridge
2007.07.04 18:51 "Re: [Tiff] BigTIFF extension", by Toby Thain
2007.07.05 10:27 "Re: [Tiff] BigTIFF extension", by Andrey Kiselev
2007.07.04 18:25 "Re: [Tiff] BigTIFF extension", by Phil Harvey
2007.07.04 18:52 "Re: [Tiff] BigTIFF extension", by Toby Thain
2007.07.04 19:59 "Re: [Tiff] BigTIFF extension", by Phil Harvey
2007.07.04 21:23 "[Tiff] BigTIFF extension", by
2007.07.04 21:36 "Re: [Tiff] BigTIFF extension", by Toby Thain
2007.07.05 05:08 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
2007.07.04 22:11 "Re: [Tiff] BigTIFF extension", by Stephen Carlsen
2007.07.05 02:41 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
2007.07.05 15:54 "Re: [Tiff] BigTIFF extension", by Toby Thain
2007.07.05 16:18 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
2007.07.04 19:17 "Re: [Tiff] BigTIFF extension", by Frank Warmerdam
2007.07.04 19:13 "Re: [Tiff] BigTIFF extension", by Bob Friesenhahn
2007.07.05 20:31 "Re: [Tiff] BigTIFF extension", by Chris Cox
2007.07.05 15:14 "[Tiff] BigTIFF - Aware Aperio version diff", by Kemp Watson
2007.07.05 16:43 "Re: [Tiff] BigTIFF - Aware Aperio version diff", by Joris Van Damme
2007.07.05 04:54 "RE: [Tiff] BigTIFF extension", by Stephen Carlsen
2007.07.05 16:32 "RE: [Tiff] BigTIFF extension", by Kemp Watson
2007.07.05 18:10 "Re: [Tiff] BigTIFF extension", by Joris Van Damme
2007.07.05 18:56 "Re: [Tiff] BigTIFF extension", by Toby Thain
2007.07.05 10:06 "Re: [Tiff] BigTIFF extension", by John Aldridge
2007.07.05 13:23 "[Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Gary McGath
2007.07.05 13:56 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Joris Van Damme
2007.07.05 14:14 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Gary McGath
2007.07.05 14:39 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Joris Van Damme
2007.07.05 21:04 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Chris Cox
2007.07.05 21:38 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Joris Van Damme
2007.07.05 22:02 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Toby Thain
2007.07.05 15:26 "Re: [Tiff] Re: Tiff Digest, Vol 38, Issue 12", by Andrey Kiselev
2007.07.05 16:23 "[Tiff] Re: BigTIFF", by Gary McGath
2007.07.05 16:54 "Re: [Tiff] Re: BigTIFF", by Joris Van Damme
2007.07.05 18:51 "Re: [Tiff] Re: BigTIFF", by Craig Bruce
2007.07.05 20:30 "[Tiff] Re: BigTIFF", by Gary McGath
2007.07.05 21:03 "Re: [Tiff] Re: BigTIFF", by Joris Van Damme
2007.07.05 20:39 "[Tiff] RE: Tiff Digest, Vol 38, Issue 16", by Kemp Watson
2007.07.05 23:30 "Re: [Tiff] RE: Tiff Digest, Vol 38, Issue 16", by Craig Bruce
2007.07.05 20:14 "Re: [Tiff] Re: BigTIFF", by Michael Wolf
2007.07.05 16:51 "Re: [Tiff] BigTIFF extension", by Andrew Brooks
2007.07.09 16:11 "Re: [Tiff] BigTIFF extension", by Stephen Carlsen
2007.07.09 16:21 "Re: [Tiff] BigTIFF extension", by Andy Cave
2007.07.09 16:25 "Re: [Tiff] BigTIFF extension", by Gary McGath
2007.07.09 16:35 "Re: [Tiff] BigTIFF extension", by Toby Thain
2007.07.09 18:36 "[Tiff] Re: BigTIFF extension", by Phil Harvey

2007.07.06 12:36 "Re: [Tiff] BigTIFF extension", by Gary McGath

I put out the arguments for and against keeping the same file extension a few years ago. They're getting rediscovered and rehashed now. But if we (Adobe) just try to legislate the decision without support from the user and developer community, it won't get very far.

So, I'm just trying to guide the discussion and see what you come up with.

To make it clear what species of dog I have in this fight: I'm looking at the issue primarily from an archiving standpoint. If people a hundred years from now dig through the metaphorical ruins and find a file and a copy of the relevant specification, will they be able to reconstruct its presentation?

If BigTIFF is incorporated into the official spec as TIFF 7.0 _and_ it's widely disseminated enough that it effectively supersedes TIFF 6.0, then that's accomplished; otherwise they'll see something which looks sorta like TIFF, and they might or might not be able to reverse engineer the differences.

What I don't what to see is two different specs which are both called TIFF, even if one incorporates the other by reference. That's where I see things heading, and that's a recipe for long-term confusion.

There's also the risk that BigTIFF won't catch on; in that case, the few BigTIFF documents that are created will stand a better chance of being recognized if they have a distinct extension or MIME type, spurring the archaeologists to more research.

If BigTIFF had been conceived from the beginning as a revision rather than a variant of TIFF, I suspect some things would have been done differently. For example, the new header might have specified whether to use classic or expanded format for the IFD offsets, the tag counts, and the number of values within a tag respectively, since it might not be necessary to incur the extra overhead of all three. The existing proposal is more of a clean break from TIFF, which is another argument for considering it a distinct format.

For that matter, if TIFF is being revised, it would be very desirable to clean up some of the ambiguities in the 6.0 spec, such as when a practice is required and when it's just recommended.

--
Gary McGath
Digital Library Software Engineer
Harvard University Library Office for Information Systems
http://hul.harvard.edu/~gary/index.html