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POWriting EXIF XPKEYWORDS with Sanselan
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2013-03-24T00:29:05.403
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2014-09-03T07:53:50.877
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2013-03-31T18:19:24.783
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I've been researching ways to write tags to my images similar to how Windows Live Photo Gallery works. I've played with several different libraries (metadata-extractor,jhead,jheader,sanselan) but have only really found Sanselan to accomodate writing the data back in that I need. I followed Apache's <a href="http://commons.apache.org/proper/commons-imaging//xref-test/org/apache/sanselan/sampleUsage/WriteExifMetadataExample.html" rel="nofollow">WriteExifMetadataExample</a> to a T & It worked flawlessly for updating the GPS data and Aperture. I then attempted to modify the example to update <code>EXIF_TAG_XPKEYWORDS</code> rather than <code>EXIF_TAG_APERTURE_VALUE</code>. In the above-linked example, I replaced the <code>TiffOutputField.create</code> line with the following: <pre><code>String currentTagsAsString = new String((byte[]) jpegMetadata.findEXIFValue(ExifTagConstants.EXIF_TAG_XPKEYWORDS).getValue()); System.out.println("current tags: '" + currentTagsAsString + "'"); String newTag = "h e l l o"; String newTagsAsString = currentTagsAsString.trim() + " ; " + newTag + " "; System.out.println("new desired tags: '" + newTagsAsString + "'"); TiffOutputField keywords = new TiffOutputField(ExifTagConstants.EXIF_TAG_XPKEYWORDS, FieldType.FIELD_TYPE_BYTE, newTagsAsString.length(), newTagsAsString.getBytes()); exifDirectory.removeField(ExifTagConstants.EXIF_TAG_XPKEYWORDS); exifDirectory.add(keywords); </code></pre> Other than commenting out the aperature and GPS update code, the rest I left alone. I will admit the format of the byte array has me a little confused so that may very well be the issue. I get no warnings/errors/etc. The process completes normally but the new Image file does not contain the updated tags. Why does the new image not contain the updated tags? Is there an easier/better way? UPDATE: I have edited the code to work with the 1.0 RC commons-imaging API instead, however the results are the same. I am including the code I used here for completeness <pre><code>TiffImageMetadata metadata = toTiffMetadata(Imaging.getMetadata(inputFile)); System.out.println(metadata.getFieldValue(MicrosoftTagConstants.EXIF_TAG_XPKEYWORDS)); TiffOutputSet outputSet = metadata.getOutputSet(); TiffOutputDirectory exif = outputSet.getOrCreateExifDirectory(); exif.removeField(MicrosoftTagConstants.EXIF_TAG_XPKEYWORDS); exif.add(MicrosoftTagConstants.EXIF_TAG_XPKEYWORDS, "helloworld;goodbye;"); writeFileWithNewTag(inputFile,destinationFile,outputSet); </code></pre> The new code works great if i use something like <code>EXIF_TAG_XPAUTHOR</code>, but using <code>EXIF_TAG_XPKEYWORDS</code> produces no errors or warnings or messages of any kind and the new file simply doens't contain the new tag data
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<java><exif>
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Writing EXIF XPKEYWORDS with Sanselan
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1. COI have found that my string formatting was a little off. The actual encoding of the original byte array does not include space characters, but instead the '0' byte. I have adjusted the code accordingly still with no luck.
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 POWriting EXIF XPKEYWORDS with Sanselan
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 USRandyaa
2. COHave you found a way to do this? That is: create new / update / overwrite the XPKEYWORDS? If not I might have found one. But rather than just posting mine I'd like to compare my approach to yours. Just to see what's different. I will soon post it here in any case.
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 POWriting EXIF XPKEYWORDS with Sanselan
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 US2dvisio

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