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February 2004

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2004.02.09 17:02 "Photoshop 8.0 and libtiff", by Don Ellis
2004.02.09 17:46 "Re: Photoshop 8.0 and libtiff", by Bob Friesenhahn
2004.02.09 18:07 "Re: Photoshop 8.0 and libtiff", by Frank Warmerdam
2004.02.09 19:42 "Re: Photoshop 8.0 and libtiff", by Don Ellis
2004.02.09 19:51 "Re: Photoshop 8.0 and libtiff", by Bob Friesenhahn
2004.02.09 19:58 "Re: Photoshop 8.0 and libtiff", by Frank Warmerdam
2004.02.09 19:59 "Re: Photoshop 8.0 and libtiff", by Thomas J Kacvinsky
2004.02.09 20:18 "Re: Photoshop 8.0 and libtiff", by Chris Cox
2004.02.09 19:48 "Re: Photoshop 8.0 and libtiff", by Bob Friesenhahn
2004.02.09 19:59 "Re: Photoshop 8.0 and libtiff", by Frank Warmerdam
2004.02.09 20:12 "Re: Photoshop 8.0 and libtiff", by Bob Friesenhahn
2004.02.09 20:36 "Re: Photoshop 8.0 and libtiff", by Don Ellis
2004.02.09 20:25 "Re: Photoshop 8.0 and libtiff", by Don Ellis
2004.02.09 20:50 "Re: Photoshop 8.0 and libtiff", by Bob Friesenhahn
2004.02.11 18:39 "Re: Photoshop 8.0 and libtiff", by Don Ellis
2004.02.13 19:11 "Re: Photoshop 8.0 and libtiff", by Don Ellis

2004.02.09 19:58 "Re: Photoshop 8.0 and libtiff", by Frank Warmerdam

Don Ellis wrote:
> Thank you for responding so quickly!
> 
> You are going to love this. Currently, I need to be able to handle TIFF
> images up to 4 GB and in the near future I am sure I will need to work with
> larger images. My company prints 4 color billboards up to 63 feet by 32
> feet, the project I am working is for printing 360 dpi up to that size. I
> have printed images derived from 2 GB to 4 GB TIFF images before. These
> images were created in Photoshop 7.0 (with the 2 GB file limit) and then
> strung together with some propriety software which used one data line per
> strip. We were hoping that Photoshop 8.0/CS on the G5 would eliminate a
> step. In the near future I am going to need TIFF files up to 8 GB and maybe
> larger.  So I am going to have to work on a 64 bit version of libtiff.
> 
> Any ideas or help would be of immensely appreciated.

Don,

The limitation of TIFF to 4GB is implicit in the use of 32bit offsets in
the file itself.  Changing libtiff won't help you get past 4GB unless you
also alter the format - at which point the files won't work with any other
application that hasn't been similarly altered.  There are other file formats
that support larger files.  Are you sure you wouldn't be better off looking
at them?

That said, I am interested in making some sort of leap to a 64bit TIFF
variant at some point with support for it in libtiff.  Hopefully in such a
way that at least all libtiff based applications would support them.  But it
is a non-trivial effort, and will be a compatbility nightmare I am sure.  For
that reason I have put up doing any work on it so far.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent