Tag reference

This section lists the “mapping” from Photini’s field names (such as “Title / Object Name”) to the Exif / XMP / IPTC tags the data is stored in. The tag names are those used by the Exiv2 library. See http://exiv2.org/metadata.html for more detail.

As far as possible Photini follows the Metadata Working Group (MWG) Guidelines for Handling Image Metadata. These specify the mapping between tags in Exif, XMP and IPTC, and say how software should reconcile any differences between information stored in equivalent tags.

Primary tags

These tags are where Photini stores its metadata. (IPTC tags are only used if they already exist in the file, in line with the MWG guidelines, unless the “write unconditionally” user setting is enabled.)

Note that “Title / Object Name” and “Keywords” are not stored in Exif. You may prefer not to use these fields to ensure compatibility with software that only handles Exif.

Photini field Exif tag XMP tag IPTC tag
Title / Object Name   Xmp.dc.title Iptc.Application2.ObjectName
Description / Caption Exif.Image.ImageDescription Xmp.dc.description Iptc.Application2.Caption
Keywords   Xmp.dc.subject Iptc.Application2.Keywords
Copyright Exif.Image.Copyright Xmp.dc.rights Iptc.Application2.Copyright
Creator / Artist Exif.Image.Artist Xmp.dc.creator Iptc.Application2.Byline
Date / time Taken Exif.Photo.DateTimeOriginal Exif.Photo.SubSecTimeOriginal Exif.Image.TimeZoneOffset Xmp.photoshop.DateCreated Iptc.Application2.DateCreated Iptc.Application2.TimeCreated
Date / time Digitised Exif.Photo.DateTimeDigitized Exif.Photo.SubSecTimeDigitized Xmp.xmp.CreateDate Iptc.Application2.DigitizationDate Iptc.Application2.DigitizationTime
Date / time Modified Exif.Image.DateTime Exif.Photo.SubSecTime Xmp.xmp.ModifyDate  
Orientation Exif.Image.Orientation    
Aperture Exif.Photo.FNumber    
Focal length Exif.Photo.FocalLength Exif.Photo.FocalLengthIn35mmFilm    
Lens maker name Exif.Photo.LensMake    
Lens model name Exif.Photo.LensModel    
Lens serial number Exif.Photo.LensSerialNumber    
Lens specification Exif.Photo.LensSpecification    
Latitude, longitude Exif.GPSInfo.GPSLatitude Exif.GPSInfo.GPSLatitudeRef Exif.GPSInfo.GPSLongitude Exif.GPSInfo.GPSLongitudeRef    
Camera address   Xmp.iptcExt.LocationCreated Xmp.iptc.Location Xmp.photoshop.City Xmp.photoshop.State Xmp.photoshop.Country Xmp.iptc.CountryCode Iptc.Application2.SubLocation Iptc.Application2.City Iptc.Application2.ProvinceState Iptc.Application2.CountryName Iptc.Application2.CountryCode
Subject address   Xmp.iptcExt.LocationShown  

Secondary tags

Photini may read information from these tags and merge it with information from the primary tags. These tags are deleted when the corresponding primary tags are saved.

Photini field Exif tag XMP tag IPTC tag
Title / Object Name Exif.Image.XPTitle   Iptc.Application2.Headline
Description / Caption Exif.Image.XPComment Exif.Image.XPSubject Xmp.tiff.ImageDescription  
Keywords Exif.Image.XPKeywords    
Copyright   Xmp.tiff.Copyright  
Creator / Artist Exif.Image.XPAuthor Xmp.tiff.Artist  
Date / time Taken Exif.Image.DateTimeOriginal Xmp.exif.DateTimeOriginal  
Date / time Digitised   Xmp.exif.DateTimeDigitized  
Date / time Modified   Xmp.tiff.DateTime  
Orientation   Xmp.tiff.Orientation  
Aperture Exif.Image.FNumber Exif.Image.ApertureValue Exif.Photo.ApertureValue Xmp.exif.FNumber Xmp.exif.ApertureValue  
Focal length Exif.Image.FocalLength Xmp.exif.FocalLength Xmp.exif.FocalLengthIn35mmFilm  
Lens maker name      
Lens model name Exif.Canon.LensModel Exif.OlympusEq.LensModel    
Lens serial number Exif.OlympusEq.LensSerialNumber    
Lens specification Exif.Image.LensInfo Exif.CanonCs.Lens Exif.Nikon3.Lens    
Latitude, longitude   Xmp.exif.GPSLatitude Xmp.exif.GPSLongitude  

Read only tags

Photini may read information from these tags and merge it with information from the primary tags. These tags are not deleted when the corresponding primary tags are saved.

Photini field Exif tag XMP tag IPTC tag
Time zone offset[1] Exif.Image.TimeZoneOffset Exif.NikonWt.Timezone    

[1] The time zone offset is not directly presented to the user. It is applied to the Date / time Taken, Date / time Digitised and Date / time Modified fields if no other time zone information is available.

Delete only tags

These tags are not read but are deleted when the corresponding primary tags are saved.

Photini field Exif tag XMP tag IPTC tag
Lens model name Exif.CanonCs.LensType    
Lens specification Exif.CanonCs.ShortFocal Exif.CanonCs.MaxAperture Exif.CanonCs.MinAperture