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https://issues.apache.org/jira/browse/SANSELAN-37?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12844618#action_12844618
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FG commented on SANSELAN-37:
----------------------------
Oh, and actually that could be exactly what the javadoc of
updateExifMetadataLossless() describes:
http://commons.apache.org/sanselan/api-release/org/apache/sanselan/formats/jpeg/exifRewrite/ExifRewriter.html
:
Note that this uses the "Lossless" approach - in order to preserve data
embedded in the EXIF segment that it can't parse (such as Maker Notes), this
algorithm avoids overwriting any part of the original segment that it couldn't
parse. This can cause the EXIF segment to grow with each update, which is a
serious issue, since all EXIF data must fit in a single APP1 segment of the
Jpeg image.
So this issue might be closed?
> Wrinting unmodified EXIF-Data to new image changes values
> ---------------------------------------------------------
>
> Key: SANSELAN-37
> URL: https://issues.apache.org/jira/browse/SANSELAN-37
> Project: Commons Sanselan
> Issue Type: Bug
> Affects Versions: 0.94-incubator
> Environment: Canon Powershot A570 IS
> Reporter: FG
> Attachments: diff.txt, out.jpg, out.txt, src.txt, src1.jpg, src2.jpg
>
>
> I used the following code, which just reads the EXIF data from a picture of a
> Canon Powershot A570 IS and writes it back to another file without modifying
> it:
> File src1 = new File("c:/temp/src1.jpg");
> File src2 = new File("c:/temp/src2.jpg");
> File dst = new File("c:/temp/out.jpg");
> IImageMetadata metadata = Sanselan.getMetadata(src1);
> TiffImageMetadata exif = ((JpegImageMetadata) metadata).getExif();
> TiffOutputSet outputSet = exif.getOutputSet();
> OutputStream os = new BufferedOutputStream(new FileOutputStream(dst));
> new ExifRewriter().updateExifMetadataLossless(src2, os, outputSet);
> os.close();
> src1.jpg is a file with EXIF data
> src2.jpg is src1.jpg without EXIF data (saved it with IrfanView and unchecked
> the appropriate checkboxes in the Jpeg Save Dialog)
> out.jpg should contain the EXIF information after the code was run.
> Actually the EXIF data is not the same after the call.
> So, is there anything wrong with the above code or with the images or is
> this a bug in Sanselan?
> Tried the same with the image of a Sony Alpha 350. The effect was much less.
> I try to attach the images and exif data in the next step.
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