EXIF data extracted from uploaded images stored incorrectly

[matt]

Currently extracted EXIF data is stored as a single custom field with a serialized array containing all the data - it should be stored with one-custom-field per data entry, probably with the exif_ prefix.

I agree. I stored it there in the first place so as to fit in with the existing method of storing image metadata.

I think we should move all of the image and attachment metadata into separate rows rather than a serialized array.

That serialized array is fetched and updated with wp_get_attachment_metadata() and wp_update_attachment_metadata(), so we can probably maintain API compatibility and just change the underlying storage method.

There are also some things in the attachment meta that could be cleaned up and standardized but that's probably best considered as a separate step.

Please also consider issues related to the EXIF content. See: ​http://trac.wordpress.org/ticket/6819