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Last modified 8 years ago Last modified on 01/07/10 18:53:02

What are Meta Data?

Definition
Meta data (or meta information) are data about other data, eg. time of recording, shutter speed, or GPS coordinates of an image.

See also: Meta Data at Wikipedia

OK. Clear text: Everyone knows the audio format mp3, right? And many of you know IDv3 - the audio information of artist, title, album, etc. So what IDv3 is for mp3, EXIF and IPTC is the same for photos files JPEG. They store additional information to the picture direct in the picture file.

In phTagr are these additional information:

  • Date
  • Tags (or keywords)
  • Categories
  • Locations
  • GPS coordinates

Storing of Meta Data

phTagr focuses on storing the meta data within the original files, mostly media files, instead of storing these additional information in an external source. The advantage of such inline meta data is that once you store the meta data within the file (e.g. an image) you can simply copy the file and the meta data is copied, too. Therefore, your attached meta data is never lost while handling with the original files.

phTagr uses the common meta data blocks so that other programs such as desktop search engings (Google Desktop, beagle, tracker) or another phTagr instance can reuse these attached information.

Currently phTagr supports only JPEG images to store the meta data. The meta data are written within the EXIF or IPTC block of the JPEG image using the external tool exiftool. Exiftool is the swiss army knife for meta data handling and it's very save regarding the storage of the sensible EXIF data block.

Note: While we trust exiftool storing our meta data, it is still recomended to keep a backup copy of your media when using phTagr!

See also: EXIF at Wikipedia

Video and Meta Data

In principle it is possible to store meta data in videos, too. But we are not aware of a common specified meta data block for videos for all video formats. Further, digital cameras creating a preview image for recorded videos. These video thumbs (mostly with the extension .thm) are used and created by phTagr to store the meta data.

See CreateVideoThumbnail for creating these video thumbnails