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From: Toby Thain <toby@telegraphics.com.au>
Date: Tue, 19 Jan 2010 13:55:21 -0500
To: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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Cc: tiff@lists.maptools.org, Phil Harvey <phil@owl.phy.queensu.ca>
Subject: Re: [Tiff] eta for bigtiff support?
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On 19-Jan-10, at 11:15 AM, Bob Friesenhahn wrote:

> On Mon, 18 Jan 2010, Phil Harvey wrote:
>
>> On 15-Jan-10, at 12:00 PM, tiff-request@lists.maptools.org wrote:
>>> What's wrong with "image/tiff" and "TIF"? GIF doesn't have different
>>> MIME types and extensions for its different versions.
>>
>>
>> This has been debated before, and probably will be debated
>> again, but my opinion is that a new file type is needed.
>>
>> Technically, according to the TIFF 6 specification, the 0x002a
>> in the TIFF header is a file identifier.  So this can not
>> be used as a version number because any file with a different
>> number is not a TIFF file according to the specification.
>>
>> This is different than GIF, which defined "87a" as a version number
>> in the original specification.
>
> Older GIF readers (such as the gif2tiff that comes with libtiff) are
> not able to read newer version GIF files.
>
> My feeling is that calling BigTIFF a new format will cause more harm
> than good.  Many existing applications will be able to read BigTIFF
> files by simply building with a newer version of libtiff.

I'm very reluctant to weigh in because I know the issue has been  
discussed at length in the past, but it should be remembered that  
thousands of applications don't use libtiff.

--Toby

> Regardless,
> I do agree it is a new format.
>
> Bob
> --
> Bob Friesenhahn
> bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/ 
> bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
> _______________________________________________
> Tiff mailing list: Tiff@lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/tiff
> http://www.remotesensing.org/libtiff/

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