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June 1999

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1999.06.20 23:05 "64-bit TIFF Meta-issues", by Niles Ritter
1999.06.21 06:31 "Re: 64-bit TIFF Meta-issues", by Niclas Borlin

1999.06.21 06:31 "Re: 64-bit TIFF Meta-issues", by Niclas Borlin

Well, Niles, couldn't we use your xtiff code for this?  (At least if we
can't persuade Adobe to join?)

Simplistic suggestion: 
- Use any tag number (I could donate one of mine), call it
  TIFFTAG_TIFF64.
- Place a TIFFTAG_TIFF64 tag in the first IFD of a 6.0 TIFF file, and
  use the TIFF_LONG value as a file offset to a TIFF64 structure.
  This structure we could define ourselves, including new types, etc.,
  even if Adobe holds back.
- The image data associated with the first IFD could hold the image
  data proper (if <4GB), be used as a "thumbnail", or have an image
  stating "This is a TIFF64 image >4GB. In order to view this image,
  you will need to update your TIFF reader from www.tiff.org (or
  whereever)."

This solution would at least be backward compatible, since older
readers would ignore the TIFFTAG_TIFF64 tag...

I have used a similar (yet 32 bit) solution to include some
patient/examination data, scanner settings, etc., in my TIFF files.

My .02 [your currency goes here].

/Niclas
--
Niclas Borlin                       email: Niclas.Borlin@cs.umu.se
Department of Computing Science     phone: (+46) 90-786 68 32     
Umea University                       fax: (+46) 90-786 61 26    
SE-901 87 Umea, SWEDEN            lat/long: 63.49 N, 20.19 E
--
A bus station is where the bus stops. A train station is where the
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