| Summary: | Interpret and display the IPTC Image-Region tag (in analogy to face tags) | ||
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| Product: | [Applications] digikam | Reporter: | Paul Krause <paul_krause_1980> |
| Component: | Metadata-Iptc | Assignee: | Digikam Developers <digikam-bugs-null> |
| Status: | REPORTED --- | ||
| Severity: | wishlist | CC: | caulier.gilles, metzpinguin |
| Priority: | NOR | ||
| Version: | 7.6.0 | ||
| Target Milestone: | --- | ||
| Platform: | unspecified | ||
| OS: | Unspecified | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
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Description
Paul Krause
2022-04-16 15:44:00 UTC
Hi, IPTC face region is not supported by Exiv2 library, the first backend used by digiKam to handle metadata. https://exiv2.org/iptc.html ExifTool, the second one, don't do it to: https://exiftool.org/TagNames/IPTC.html Without one of this backend supporting this information, we will not able to do it in digiKam. Also, XMP support image region, and digiKam is able to handle this information (read/write). Gilles Caulier IPTC Image Regions doesn't appear to be in the list of supported IPTC tags. However according to this thread Exiftool probably supports this tag. However, it is not recommended to use it as currently no software except ExifTool supports it. https://exiftool.org/forum/index.php?topic=12499.0 Maik Here is a sample image. Yes, ExifTool knows IPTC Regions. Since IPTC Regions is just an extension of XMP, Exiv2 can also read it. https://www.iptc.org/std/photometadata/examples/image-region-examples/ https://www.iptc.org/std/photometadata/examples/image-region-examples/images/photo-4iptc-heads.jpg My personal opinion is that IPTC Image Regions will not see widespread use. Of course I could be wrong... Maik Dear Maik, dear Gilles, I do not dare to predict the usage, but, according to some googling, there is virtually no software using them at the moment. The only "big" usage of non-face regions I'm aware of is Wikimedia Commons, for example: https://commons.wikimedia.org/wiki/File:Helsinki-hafen-panorama.jpg https://commons.wikimedia.org/wiki/File:Image-February_21,_2008_lunar_eclipse_and_stars,_West_Hartford,_CT,_3-17_UTC.jpg I'd just guess, the more software, and image repositories, support non-face regions, the likelier for others to do so too. In case there is only doubt about the specific IPTC regions, personally I would be fine with some other implementation too. But, I do not see a good alternative to appear soon. A) The region in the MWG namespace [1] is to limited. E.g., it only allows regions (per the tag mwg-rs:Type) for "BarCode", "Face", "Focus" and "Pet". The MWG seems to be dead, so little hope for a new version. B) Inventing new tags, or a whole namespace, and expanding, or breaking, some existing specification is similar to the Acdsee namespace in xmp, which exiftool comments with "Your applications mumble to themselves instead of speaking out for the rest of the world to hear." [2]. [1] https://web.archive.org/web/20180919181934/http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf#page=51 [2] https://exiftool.org/TagNames/XMP.html#acdsee Thanks, Paul I forgot: The tag mwg-rs:Type for MWG regions is optional and specifically not to be set for anything outside the closed choice (Face, Barcode, ...). Duplicating the faces tab, but stripping the face detection etc, together with the display in the preview area and handling all MWG regions with type != "Face" with this new code, sounds like the second best option for me. Just for info, I know you just want to demonstrate what IPTC image regions are used for. But the two images from Wikimedia are not IPTC image regions, the metadata of the images do not contain regions. So it's probably just a matter of HTML regions. Maik I do not know if I understand you correctly, or if my answer matters, but:
You are absolutely right, these regions on Wikimedia Commons are not IPTC Image regions.
I was aware of that, but possibly I'm not writing clear enough.
What I wanted to show is, that regions (not necessary IPTC or MWG ones) are used for something else then faces.
Possibly Wikimedia Commons ("Annotations") and Flickr ("Photo notes") are the only ones, but still somebody is using non-face regions.
It probably would have been smarter to not ask for IPTC Image regions from the very beginning. They just seem to be the best choice to me.
Paul
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