Camera-Roll-Android-App
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kollerlukas
Tag photos
Can you add a function to tag and sort photos by different categories?
In this context, "browse by tag" would come in very convenient – especially if one could assign multiple tags per photo. This would then create "virtual albums" with all photos using the selected tag(s).
A bonus would be if those tags could also be saved to Exif. Just checked available Exif tags for possible locations:
Exif.Image.XPKeywords(0x9c9e): Keywords tag used by Windows, encoded in UCS2
could be a fitting place. Alternatively, Which EXIF tag to store keyword/tag for a photo? has some suggestions (the IPTC "keywords" tag mainly). The latter is what obviously is recommended and used by exiftool as well, so it's probably preferable – for one as being less proprietary, and for the other as being available "cross-platform". That way exchanging photos with keywords kept intact should be easy.
I just did some research on how to save keywords in image files. I would prefer XMP because it supports more file formats (e.g. IPTC doesn't support .gif). Reading XMP metadata from files isn't issue, there a plenty of libraries out there (e.g. metadata-extractor), but the issue is writing the keywords to the file. For now I couldn't find a suitable library that gets the job done. So this would be a bigger project, to get this feature working...
Just an addition to the tagging feature request: On my laptop, I use KDE digikam, it allows to tag but also flag and rate pictures, and save metadata to files. Flagging sets a red, orange or green flag (PickLabel: 1|2|3), rating goes from 1 to 5. The metadata can be accessed and modified with exiftool for example. Rating and PickLabel are XMP metadata according to exif tool documentation.
I think easy accessible rating and flagging on top of tagging would also be real gain for the app, so it can be used to powerfully organize and select pictures. (If the writing metadata to files issue can be solved.)
