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Date: Fri, 16 Mar 2012 08:37:23 +0800
From: Steve Underwood <steveu@coppice.org>
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Cc: tiff@lists.maptools.org
Subject: Re: [Tiff] RFC3949 TIFF-FX support
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On 03/16/2012 02:09 AM, Bob Friesenhahn wrote:
> On Thu, 15 Mar 2012, Frank Warmerdam wrote:
>> It seems we have had TIFF-FX discussions before and they went no
>> where for some reason, but I don't recall any details.
>
> It seems that we could easily support TIFF-FX tags but my recollection 
> is that TIFF-FX data needs to be output in a specific order and 
> libtiff does not provide any such assurance so libtiff is not assured 
> to write TIFF-FX complaint TIFF.
>
> Bob
By specific order I assume you are referring to the weird part of 
TIFF-FX, where a block of tags can be created on a page, using

TIFFTAG_GLOBALPARAMETERSIFD,which apply to all pages.That part can't really be fully expressed by libtiff, as libtiff stands. All the other tags are harmless, and do not create conflicts. I can't think of any reason they should not go into libtiff. Adobe was involved in the definition of TIFF-FX, so if they had created conflicts that would have been pretty stupid.

Regards,
Steve

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