[jira] [Commented] (IMAGING-112) JpegIptcRewriter.removeIPTC() does not remove all metadata

["Xavier Dury (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMAGING-112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13962951#comment-13962951 ] 

Xavier Dury commented on IMAGING-112:
-------------------------------------

Another method (to remove all the metadata) or even a flag is fine for me.

Currently, I export each image to a raw format which has no metadata associated and then I compute hashes... but the drop in performance is dramatic. Another way would be to provide a way to isolate/extract the image raw data bytes and compute the hash directly from that... but I don't know if that is possible.

> JpegIptcRewriter.removeIPTC() does not remove all metadata
> ----------------------------------------------------------
>
>                 Key: IMAGING-112
>                 URL: https://issues.apache.org/jira/browse/IMAGING-112
>             Project: Commons Imaging
>          Issue Type: Improvement
>    Affects Versions: 1.0
>            Reporter: Xavier Dury
>         Attachments: ImageTest.java
>
>
> I'm trying to compute hashes from my images to detect duplicates.
> To do so, I strip every metadata (like keywords I may have added) then compute a CRC32.
> My problem is that JpegIptcRewriter.removeIPTC() does not remove all metadata as there is always a difference of 18 bytes (containing "Photoshop 3.0").
> So could it be possible to remove those 18 bytes as well in removeIPTC() so that I can compute hashes?
> Thanks,
> Xavier



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