[jira] [Created] (IMAGING-221) updateExifMetadataLossless restructures meta data (and problems with Maker Notes)

["Joakim Knudsen (JIRA)" <ji...@apache.org>]

Joakim Knudsen created IMAGING-221:
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             Summary: updateExifMetadataLossless restructures meta data (and problems with Maker Notes)
                 Key: IMAGING-221
                 URL: https://issues.apache.org/jira/browse/IMAGING-221
             Project: Commons Imaging
          Issue Type: Bug
            Reporter: Joakim Knudsen
         Attachments: original.JPG, original.html, test.JPG, test.html

ExifRewriter's *updateExifMetadataLossless* method causes the meta data of the JPEG to be completely reordered after writing. This, in itself, might not be a big concern, but it's a bit unexpected when the method is named "lossless". More worryingly, I also find problems are introduced wrt. the Maker Notes tag (odd offset). 

I've produced an example of the problem in the attached JPEG file, using ExifTool to validate/analyze the images before and after. The image is taken by a Sony Xperia Z5 phone, and the "original.JPG" validates OK. After modifying the contents of the UserComments tag (value: "Test") the modified image produces a warning:

Verifying the attached photo using ExifTool gives the following output:
$ ./exiftool\(-k\).exe -validate -warning -a ../test.JPG
-- press RETURN --
 
Validate                        : 1 Warning (all minor)
Warning                         : [minor] Possibly incorrect maker notes offsets (fix by -628?)
 
Using ExifTool's -htmldump option, it is easy to see how the meta data has been affected.



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