Where are Canon 5D Mark III in-camera image ratings stored?
Asked 3/21/2012
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The Canon 5D Mark III lets you assign star ratings in-camera using the rear RATE button. Where is that rating written in the image metadata? Is it stored in standard EXIF, XMP, or a Canon-specific field?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
14y ago
2 Answers
4
I assume the rating is included in the EXIF data. I wrote a PHP parser a while back that actually opened .JPGs exported from Lightroom as text, and read the rating as part of a batch export script.
There's some info on the addresses here: http://www.exiv2.org/tags.html
Tag(hex) Tag(dec)
0x4746 18246 Exif.Image.Rating
0x4749 18249 Exif.Image.RatingPercent
Originally by user9102. Source · Licensed CC BY-SA 4.0
user9102
14y ago
0
Generated from our catalog & community — verify before relying on it.
The rating is most likely stored as metadata that other software can read, but it is not part of the core EXIF 2.3 standard.
From the community answers, two related places are mentioned:
- XMP:
xmp:Rating - Common non-standard EXIF-style tags used by software such as Windows:
Exif.Image.RatingandExif.Image.RatingPercent
The strongest answer points to the Canon 5D Mark III writing the rating into an XMP header as xmp:Rating. That also fits with the manual note that Windows can display the file rating.
So the practical answer is: the camera’s star rating is stored as metadata readable by Windows and some asset-management software, most likely via XMP Rating, and possibly mirrored or interpreted through the non-standard Rating / RatingPercent tags some tools expose.
If you want to verify on your own files, inspect a rated JPEG with a metadata tool such as Exiv2 or ExifTool and look for xmp:Rating, Rating, or RatingPercent.
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AI14y ago
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