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Re: [PanoToolsNG] A question on the TIFF format

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  • Jim Watters
    Yes it is possible. There was a problem with tiff file format using jpeg compression. Version 6 of the tiff specification was interpolated differently by
    Message 1 of 25 , Feb 23, 2009
      Yes it is possible.

      There was a problem with tiff file format using jpeg compression.

      Version 6 of the tiff specification was interpolated differently by
      different companies resulting in various tiff libraries. Some of these
      variations are incompatible. Some of these were widely used. Even by
      Microsoft.

      http://www.remotesensing.org/libtiff/TIFFTechNote2.html

      It is also possible that the specification to implement jpeg compression
      inside tiff files was used to write jpeg files.

      If you can find software that can load these images. It might be best
      to save them in another format. There are several software on the
      internet that
      claim to fix jpeg corruption. You might want to try these.

      To be future safe the jpeg compression inside tiff should be compression 7

      To prevent confusion with the old design, the new
      design is given a new Compression tag value,
      Compression=7. Readers that need to handle
      existing 6.0 JPEG files may read both old and
      new files, using whatever interpretation of the
      6.0 spec they did before. Compression tag value 6
      and the field tag numbers defined by 6.0 section
      22 will remain reserved indefinitely, even though
      detailed descriptions of them will be dropped
      from future editions of the TIFF specification.



      --
      Jim Watters

      Yahoo ID: j1vvy ymsgr:sendIM?j1vvy
      jwatters @ photocreations . ca
      http://photocreations.ca


      Mathew Hargreaves wrote:
      > [snip]
      > With all of the expertise here, the basic question still has not
      > been answered.
      http://tech.groups.yahoo.com/group/PanoToolsNG/message/27172
      > Has the encoding of the files been altered with the newer
      > versions of Tiff and JPG formats? In that, the written file header is
      > written in a way that older softwares like Windows 98ME or Elements 2
      > actually cannot see the file, because the information is not set up in a
      > form it can read?
      > While the current softwares are backwards compatible, have they
      > altered enough like a mutating virus, they are no longer wrokable with
      > my older software.
      >
      > CHEERS...Mathew
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