Take your camera, set the shutter to 2 seconds on a tripod. After 1s, spin the camera. If you setup exposure correctly, you'll end up with a photograph with a

Take your camera, set the shutter to 2 seconds on a tripod. After 1s, spin the camera. If you setup exposure correctly, you'll end up with a photograph with a sharp subject from the first 2s, and an ephemeral blur from the movement from the second second of the single photo. By your definition that's a photography, but doing anything in post production isn't 'photography'. The point is that photography in general is an art that the artist (photographer) massively controls, the photographers vision of the moment. Whether you do it fully in camera or in post production is somewhat irrelevant as it's the same thing. Restrictions on how that photograph is used should be clear though (no compositing in journalistic photography as an example).