For Mac users, a good idea is to keep digital photos in the application Photographs. It has many interesting options for sorting and storing information about each picture separately. From the model of the camera or the mobile phone from which the capture was taken, and up to date, resolution, focus (focal length), aperture, GPS coordinates. All this information metadata from the photo file are added by the camera in a format EXIF. No separate file is required for EXIF.
Additional information added to a photo as well locations, facial identification of the people in the picture, keywords, copyright and other details can be added manually in the application Photographs or in other similar photo management and administration applications. This information will be manually added to the metadata and retained in the standard IPTC (International Press Telecommunications Council).
The new versions of iOS are able to automatically add a lot of information in IPTC with little help from the user. For example, if in an image you are suggested to add a name for a detected face, the application will automatically search for and detect that face in other photos. Thus it can do a quick sorting and a separate virtual gallery. "People & Places"On iOS 13, for example.
All in IPTC tags are also retained in an image in Finder pe Poppy.
Example of extended metadata see in the image below:
XMP files contain IPTC metadata information. These files it is saved separately along with the photo file, and can be imported into advanced graphics editing programs as well Lightroom, Adobe Photoshop, application Photographs from macOS or similar. In this file you will also find information about the changes made to the photograph and the application on which they were made.
If you have added such information in the photos in the Photos application, it is good to check "Export IPTC as XMP"Upon their export.
To keep these extra metadata in the image file, you can opt for first export option, and the resulting file will keep all the data, without the need for additional XMP.
"Export Unmodified Original Photo" with "Export IPTC as XMP"Will save a file with the original picture, without additional metadata, plus a file XMP which will contain additional data. In most cases there is no need for this XMP. Note that with this option, the exported picture will be the original one, so how it was captured by the camera. The filters applied and other changes made to the Photos application will be lost. For the export of the edited photograph, the option “Export Photo ..."
Model: Mouse (I.e.What are the XMP files resulting from exporting photos from the Photos application