Dave wrote:

If you are photographed, you own the copyright to that image unless you
agree otherwise with the photographer.

Rubbish. The photographer owns copyright, as the person who made the
image. The photographer may assign that copyright to someone else,
perhaps in exchange for a fee, but in the absence of such an
arrangement, the copyright rests with the person responsible for making
the image.

It *is* the case that someone who publishes a picture (whether or not
they took it themselves) may want to assure themselves that they have
the permission of the person whose picture it is to publish it
(typically by use of a "model release") but that's a different matter.

--
http://gallery120232.fotopic.net/p9632774.html
(20 196 and 20 194 at Warrington Bank Quay, Jun 1985)