This is from The American Society of Media Photographers, Inc.:
"Copyright is a right, granted to you by law, to control the copying,
reproduction, distribution, derivative use, and public display of your
photographs, and to sue for unauthorized use (infringement) of your work.
This right begins at the moment you fix your photographic expression in
a tangible form, that is, when you create the latent image on film.
Copyright ownership, bestowed automatically when you make an image, does
not depend upon registration with the copyright office or placement of a
copyright notice on the image." (italics added.)