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I am developing a photo gallery which will read/write EXIF tags. I will put photo title in the EXIF tag DocumentName and description in EXIF tag ImageDescription. I also plan to use the geo-tags. But what about photo tags/categories? I want to store a space-separated string of the tags a photo is tagged with in my system. Is there any EXIF tag that is normally used for this type of information? I could write my own (i.e. PhotoTags) but I guess that is not really of any use except for internally in my system (where this information is stored in a database anyway).
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EXIF data is stored embedded into the physical file of the image, and therefore can only be accessed by specific software. The information is removed when a photo is converted to formats other than JPEG, such as PNG or GIF.
EXIF data (also sometimes referred to as metadata) contains information such as aperture, shutter speed, ISO, focal length, camera model, date the photo was taken and much more. You can also include copyright information in your EXIF data when you register your camera through the manufacturer.
I think that will want to look into IPTC and/or XMP (not entirely clear over their relation) for storing metadata about images (such as keywords/tags, title, description and so on).
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