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Posted to issues@commons.apache.org by "Bruno P. Kinoshita (JIRA)" <ji...@apache.org> on 2019/05/03 08:44:00 UTC
[jira] [Commented] (IMAGING-221) updateExifMetadataLossless
restructures meta data (and problems with Maker Notes)
[ https://issues.apache.org/jira/browse/IMAGING-221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16832368#comment-16832368 ]
Bruno P. Kinoshita commented on IMAGING-221:
--------------------------------------------
Thanks for the link and the good issue description [~joakimk]. First issue added to the next 1.0-alpha2 release.
> 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
> Assignee: Bruno P. Kinoshita
> Priority: Major
> Fix For: 1.0-alpha2
>
> 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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