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Date: Fri, 21 Jan 2005 21:27:43 +0100
From: Antoine <melser.anton@gmail.com>
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To: tiff@remotesensing.org
Subject: Re: [Tiff] deleting tags!
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Frank Warmerdam wrote:
> On Fri, 21 Jan 2005 19:29:08 +0100, Antoine <melser.anton@gmail.com> wrote:
> 
>>ps. what exactly do we lose with tiffcp? I found one way of "deleting" a
>>tag - tiffcp will fail to copy a tag if it has an illegal value for its
>>value (or values, I think it was the number of values that it takes, or
>>size of the value, I forget, anyway we had dateTimes that had 25
>>whatevers and should only have 20, the tag was present before setting
>>another tag, and absent after...)
> 
> 
> Antoine, 
> 
> As to what we lose with tiffcp, I can't give a precise answer.  But
> there are esoteric tags not addressed in the list processed by
> tiffcp.  Also, tiffcp unpacks and repacks the imagery and as far as 
> I know this could lose (or correct) some quirks of the original image.
> 
> Best regards,

Cool,
I guess I'll have a look and see what I can understand in tiffcp. In 
fact, for what we wanted to do getting rid of the unknown tags was a 
feature! There were some tags photoshop put in that are also not in the 
ATA spec, so they had to go - tiffcp not copying them was great. I guess 
at the very least it will be a good base to work from. I warn you, you 
may get some silly questions though. I will try my best ;-).
Cheers
Antoine
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