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Where is my data stored?

All information entered using iTag is written to the IPTC and XMP headers of each file.

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

RAW, TIFF, PNG

AVI, MP4

MP3, WAV

Metadata Engine

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.

JPEG Compatibility

Below is a table that lists the known applications that all work with JPEG IPTC and XMP headers

Application

Comments

XMP Storage Location

Title

Description

Tags

Desktop Applications

iTag

100% compatible with itself!

/xmp/dc:title

/xmp/exif:UserComment
/xmp/dc:description

/xmp/dc:subject

Adobe Photoshop CS3

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

Windows Vista Photo Gallery

Fully compatible

/xmp/dc:title

/xmp/exif:UserComment

/xmp/dc:subject

Windows Live Photo Gallery

Fully compatible

/xmp/dc:title

/xmp/exif:UserComment

/xmp/dc:subject

Microsoft Pro Photo Tools
(formerly Photo Info)

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

Application

Comments

IPTC Storage Location

Title

Description

Tags

Desktop Applications

iTag

100% compatible with itself!

IPTC.Headline &
IPTC.ObjectName

IPTC.Caption
JPEG.Comment (read only)

IPTC.Keywords

Adobe Photoshop CS3

Fully compatible

Adobe Lightroom

Fully compatible

BreezeBrowser Pro 1.7.2

Fully compatible

Copernic Desktop Search 2

Fully compatible

Exifer

Fully compatible

ExifTool

Fully compatible

Exiv2

Fully compatible

GeoSetter

Fully compatible

GraphicConverter (Mac)

Fully compatible

IDimager

Fully compatible

IrfanView

Fully compatible

Mapivi

Fully compatible

Opanda IExif

Fully compatible
(Editing requires PowerExif which isn't free)

Photo Mechanic

Fully compatible

Pixvue [Discontinued]

Fully compatible

IPTC.ObjectName

IPTC.Caption

IPTC.Keywords

XnView

Fully compatible

Photo Album Viewer/Generator

Adobe Photoshop Album 3.2

Not compatible.
Metadata appears to be stored in proprietary database

JAlbum

Fully compatible when using Chameleon skin

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

Cooliris

Compatible when gallery is generated by iTag

-

Porta

Fully compatible

Web based Applications

Flickr

Fully compatible

Fotki

Fully compatible

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

Zooomr

Fully compatible

Photo Uploaders

Flickr Uploadr

Fully compatible

JUploadr

Title is ignored.
Caption & Tags are automatically read in.

-

IPTC.Caption

IPTC.Keywords

Vista Flickr Uploader

Fully compatible

IPTC.ObjectName

IPTC.Caption

IPTC.Keywords

Besides Title, Description and Tags - iTag allows the editing of several other fields. Their respective storage locations are listed below:

Other iTag fields

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

Let me know of any errata or if you use a different application that works with IPTC or XMP.

Saved from http://www.itagsoftware.com/compatibility.php
Sat Jul 09 2011 23:59:54 GMT+0200
Saved by UnMHT Ver.5.6.9