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From: "Joris" <joris.at.lebbeke@skynet.be>
To: "Andy Cave" <andy.cave@hamillroad.com>, <sc42business@mac.com>,
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Date: Tue, 3 Jul 2007 14:39:53 +0200
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Subject: [Tiff] Re: Big TIFF Compression
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Status:   

Andy,

Andy Cave wrote:
> A bit of a hi-jack, but it's a valid question. All these people who
> want to use BigTIFF, what sort of compression are they planning on
> using? Any? None? Is their image data 1 bit (Huffman, G3, G4, LZW,
> JBIG or...) or 8 bit (LZW, Flate or...)?
>
> Just curious.

As far as I know, the answer is 'any and all'. There's no reason I know off 
why their intention as to compression should be any different from the 
intention ClassicTIFF users had before. Except for...

Some TIFF users may have a slight preference for no compression, because of 
interchange reasons or some other private reasons that have to do with their 
image flow inside their process. It's reasonable to assume these users are 
the ones that suffer most from ClassicTIFF size limitation, so they might be 
the first to resort to BigTIFF in bigger numbers, so we might see a higher 
percentage of BigTIFF files that are not compressed, compared to ClassicTIFF 
files that are not compressed.

Also, some particular domains of applications of TIFF, like georeferencing 
and medical imaging software, might be the ones that traditionally write the 
largest TIFFs, and suffer the ClassicTIFF size limitation more then, say, 
FAX communication software. So, compression modes like JPEG or so that are 
often used in these fields, might also be seen in slightly higher 
percentages in BigTIFF.


Best regards,

Joris Van Damme
info@awaresystems.be
http://www.awaresystems.be/
Download your free TIFF tag viewer for windows here:
http://www.awaresystems.be/imaging/tiff/astifftagviewer.html
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