AWARE [SYSTEMS] Imaging expertise for the Delphi developer
AWare Systems, Imaging expertise for the Delphi developer, Home TIFF and LibTiff Mailing List Archive

LibTiff Mailing List

TIFF and LibTiff Mailing List Archive
June 1999

Previous Thread
Next Thread

Previous by Thread
Next by Thread

Previous by Date
Next by Date

Contact

The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems



Valid HTML 4.01!



Thread

1999.06.03 19:48 "Large File Support", by Bruce Forsberg
1999.06.04 03:45 "Re: Large File Support", by Frank Warmerdam
1999.06.04 07:32 "Re: Large File Support", by Rob Tillaart
1999.06.07 07:05 "Re: Large File Support", by Rainer Wiesenfarth
1999.06.08 21:14 "Re: Large File Support", by Peter Smith
1999.06.08 21:58 "Re: Large File Support", by Ed Grissom
1999.06.08 22:52 "Re: Large File Support", by Peter Smith
1999.06.09 01:27 "Re: Large File Support", by Martin Bailey
1999.06.09 06:50 "Re: Large File Support", by Owen Pearn
1999.06.09 14:33 "Re: Large File Support", by Martin Bailey
1999.06.09 08:07 "Re: Large File Support", by Rob Tillaart
1999.06.04 18:35 "Re: Large File Support", by Bruce Forsberg
1999.06.07 13:03 "Re: Large File Support", by Frank Warmerdam
1999.06.09 03:05 "Re: Large File Support", by <glen@lumisys.com>
1999.06.09 13:13 "Re: Large File Support", by Ed Grissom
1999.06.09 13:33 "Re: Large File Support", by Frank Warmerdam
1999.06.09 14:08 "Re: Large File Support", by Ed Grissom
1999.06.09 18:50 "Re: Large File Support", by Chris Barker
1999.06.09 18:41 "Large File Support", by Chris Barker
1999.06.10 13:21 "Re: Large File Support", by Chris Hanson
1999.06.10 13:52 "Re: Large File Support", by Frank Warmerdam
1999.06.10 14:37 "Re: Large File Support", by John Aldridge
1999.06.10 15:10 "Re: Large File Support", by Peter Smith
1999.06.10 16:56 "Re: Large File Support", by Chris Barker
1999.06.14 11:16 "Re: Large File Support", by Martin Bailey
1999.06.14 14:58 "Re: Large File Support", by Tom Lane
1999.06.14 15:30 "Re: Large File Support", by Eric Shapiro
1999.06.14 16:27 "Re: Large File Support", by Chris Barker
1999.06.14 15:51 "Re: Large File Support", by Martin Bailey
1999.06.09 15:52 "Re: Large File Support", by Ed Grissom
1999.06.10 09:48 "Re: Large File Support", by Klaus Bartz
1999.06.10 13:05 "Re: Large File Support", by Chris Hanson
1999.06.11 01:48 "Re: Large File Support", by <glen@lumisys.com>

1999.06.08 21:58 "Re: Large File Support", by Ed Grissom

Peter -

Although your question was not addressed to me, I'll give you my input
anyway....

For uncompressed files, the limit has already been passed.  Our
photogrammetric scanner is capable of scanning a 10"x10" aerial photo
negative at 3500 DPI in 24bit RGB.  With a full set of overviews (required
for our workflows), this comes out to nearly 5GB uncompressed.  Any
enhancements we might do to this product ( increase DPI, increase bit depth,
etc.) will only make the problem more pronounced.

Unfortunately, compression is often not an option.  PackBits does a pretty
lousy job on scanned photos, and is essentially unusable for >8bit data.
LZW is patented and both LZW and Deflate will typically only reduce these
types of images to ~75% of the original size.  

JPEG has been our savior so far, but some folks (especially in Remote
Sensing) are very particular about original pixel values and do not want to
use JPEG compression which modifies the data - however slight the
modification is. 

I have here on my desk two CD's, each containing a Wavelet compressed file
(LizardTech) that would be over 15GB uncompressed.  These were created as a
mosaic of over a hundred TIFF files.  Although the wavelet compression gets
them down to less than 650MB, there is nothing comparable in TIFF that would
allow me to convert these files (in their entirety) to TIFF.

Recently a customer claimed to have a 40GB (uncompressed) file that he
wanted to convert to TIFF. If I remember correctly, it was 6GB compressed. I
am not sure what file format was used, perhaps NITF (NITF handles up to 17GB
compressed).   

If you ask me, Frank was understating the problem. :)

--
ed grissom
egrissom@ziimaging.com

> -----Original Message-----
> From:	Peter Smith [SMTP:psmith@creo.com]
> Sent:	Tuesday, June 08, 1999 4:15 PM
> To:	TIFF Mailing List; warmerda@home.com
> Subject:	Re: Large File Support
> 
> Frank
> 
> When you say:
> 
> "Within the remote sensing, and photogrammetry community the 4GB limit is
> becoming significant already"
> 
> are you referring to files that are 4GB compressed or uncompressed?  
> -----------------------------------------------------------------
> Peter Smith
> mailto:plsmith@island.net  
> mailto:psmith@creo.com (forwarded directly to the above address)
> Phone: 250-285-2294