For Mac users, a good idea is to keep the digital photos in the application Photos. It has many interesting options for sorting and storing information about each individual picture. From the model of the camera or mobile phone from which the capture was made, and to the date, resolution, focus (focal length), diaphragm (aperture), GPS coordinates. All this information metadate 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 Photos or in other similar photo management and administration applications. This information will be added manually in metadate and will be retained in the standard IPTC (International Press Telecommunications Council).
Newer versions of iOS are able to automatically add a lot of information to IPTC with little help from the user. For example, if you are suggested to add a name to a detected face in an image, the application will automatically search for and detect that face in other photos as well. Being able to do a quick sort 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 Mac.
Example of metaextended date see in the image below:
XMP files contain information from metaIPTC data. 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 Photos from macOS or similar. In this file will also be found information about the changes made to the photograph and the application on which they were made.
If you have added such information in the pictures in the application Photos, it is good to check "Export IPTC as XMP”For their export.
To keep these metaadditional date 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 XMPWill save a file with the original picture, without metaadditional date, 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. Filters applied and other changes made to the application Photos they will be lost. To export the edited photo, the option remains "Export Photo".
Model: Mouse (I.e.What are the XMP files resulting from the export of photos from the application Photos