Where is my data stored?
All information entered using iTag is written to the IPTC and XMP headers of each file. What this means is that any application understanding these headers can also read and write the tagged data.
Below is an indication of where iTag stores the captions for each file type and what applications can also see this information:
| File Type |
IPTC |
XMP |
| JPEG |
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| RAW, TIFF, PNG |
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| AVI, MP4 |
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| MP3, WAV |
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Technical details
All files supported by iTag are read and written using the Adobe XMP Toolkit since build 374.
Older versions of iTag used Microsoft's Windows Imaging Component however it proved to have many problems and Microsoft have been slow to release fixes.
Another major advantage of the Adobe XMP Toolkit is that it does not offset the EXIF Makernotes as WIC does.
AVI Compatibility
I don't know of any other application currently capable of performing AVI tagging but if you want to verify the XMP is in the file, open up a (small!) avi in your favorite text editor and search for "xmp".
RAW Compatibility
Depending on the particular format, some Microsoft products such as Pro Photo Tools and Windows Live Photo Gallery may be able to read the data too but their RAW support is lagging somewhat.
Adobe Photoshop should have no issues finding the metadata.
XMP Storage
| Application |
Comments |
Title |
Description |
Tags |
| Desktop Applications |
| iTag |
100% compatible with itself! |
/xmp/dc:title |
/xmp/exif:UserComment
/xmp/dc:description |
/xmp/dc:subject |
| Adobe Photoshop |
Fully compatible |
/xmp/dc:title |
/xmp/dc:description |
/xmp/dc:subject |
| Adobe Lightroom |
Fully compatible |
/xmp/dc:title |
/xmp/dc:description |
/xmp/dc:subject |
| GeoSetter |
Fully compatible |
/xmp/dc:title |
/xmp/dc:description |
/xmp/dc:subject |
| GraphicConverter (Mac) |
Fully compatible |
/xmp/dc:title |
/xmp/dc:description |
/xmp/dc:subject |
| Microsoft Photo Gallery |
Fully compatible |
/xmp/dc:title |
/xmp/exif:UserComment |
/xmp/dc:subject |
| Microsoft Pro Photo Tools |
Fully compatible |
/xmp/dc:title |
/xmp/exif:UserComment |
/xmp/dc:subject |
| Vista Flickr Uploader |
Fully compatible |
/xmp/dc:title |
/xmp/exif:UserComment |
/xmp/dc:subject |
IPTC Storage
| Application |
Comments |
Title |
Description |
Tags |
| Desktop Applications |
| iTag |
100% compatible with itself! |
IPTC.Headline &
IPTC.ObjectName |
IPTC.Caption
JPEG.Comment (read only) |
IPTC.Keywords |
| Adobe Photoshop |
Fully compatible |
|
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| Adobe Lightroom |
Fully compatible |
|
|
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| BreezeBrowser Pro |
Fully compatible |
|
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| Copernic Desktop Search |
Fully compatible |
|
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| Exifer |
Fully compatible |
|
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| ExifTool |
Fully compatible |
|
|
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| Exiv2 |
Fully compatible |
|
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| GeoSetter |
Fully compatible |
|
|
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| GraphicConverter (Mac) |
Fully compatible |
|
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| IDimager |
Fully compatible |
|
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| IrfanView |
Fully compatible |
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| Mapivi |
Fully compatible |
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| Opanda IExif |
Fully compatible
Editing requires PowerExif which isn't free |
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| Photo Mechanic |
Fully compatible |
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| XnView |
Fully compatible |
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| Photo Album Viewer/Generators |
| Adobe Photoshop Album |
Not compatible.
Metadata appears to be stored in proprietary database |
|
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| JAlbum |
Fully compatible when using Chameleon skin |
|
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| J.River Media Center |
Title is ignored.
Caption & Tags are automatically read in. |
- |
IPTC.Caption |
IPTC.Keywords |
| Picasa |
Title is ignored.
Caption & Tags are automatically read in. |
- |
IPTC.Caption |
IPTC.Keywords |
| Porta |
Fully compatible |
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|
| Web based Applications |
| Flickr |
Fully compatible |
|
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| Fotki |
Fully compatible |
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| Panoramio |
Geocode compatible |
- |
- |
- |
| Picasa Web Albums |
Title is ignored.
Caption & Tags are automatically read in. |
- |
IPTC.Caption |
IPTC.Keywords |
| SmugMug |
Title is ignored.
Caption & Tags are automatically read in. |
- |
IPTC.Caption |
IPTC.Keywords |
| Photo Uploaders |
| Flickr Uploadr |
Fully compatible |
|
|
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| Vista Flickr Uploader |
Fully compatible |
IPTC.ObjectName |
IPTC.Caption |
IPTC.Keywords |
Other Fields
Besides Title, Description and Tags - iTag allows the editing of several other fields. Their respective storage locations are listed below:
| iTag Field |
Storage |
| Author |
/xmp/dc:creator
IPTC.Byline |
| Copyright |
/xmp/dc:rights
IPTC.Copyright |
| Rating |
/xmp/xmp:rating
/xmp/MicrosoftPhoto:Rating |
| GPS Latitude |
EXIF.GPSLatitude, EXIF.GPSLatitudeRef
/xmp/exif:GPSLatitude |
| GPS Longitude |
EXIF.GPSLongitude, EXIF.GPSLongitudeRef
/xmp/exif:GPSLongitude |