Add setting to remove private metadata (geo location and exif tags "user comment" and "subject location")

[ramack]

GPS data is concerning privacy, we should add a setting to remove it (beside exif tags "user comment" and "subject location")

Setting can have the options

• strip private metadata (GPS data and exif tags ... are removed before uploading)
• keep private metadata (metadata not modified before upload)
• ask (default) (if GPS data, user comment or subject location is available in the metadata)

I'd even like to see this setting gallery specific, as I have two gelleries, one for private use, where I'd like to have the GPS data always, and a public one where I'd like to be asked every time.

@EddyLB: how is it done on iOS?

edit: refined issue with description of what is considered private metadata

[EddyLB]

@ramack , the iOS app provides a way to strip GPS metadata before uploading images to a Piwigo server. This is one of the Default Upload Settings as shown in the attached screenshot.

[ramack]

and what is considered "private metadata" in the files? GPS coordinates clear, but anything else?

[EddyLB]

Yes, the app also removes the EXIF 'user comment' and 'subject location'.