I think b&w photography have characteristics VERY different from colour photography. In colour, you work basically within narrow limits... you have to do standard processes in order to achieve natural colours and normal contrast, and the creative process is basically the moment you work with the camera. In b&w, you don't work with colours; you work with shadows, and a the creative process involves the whole process from taking the photo with the camera through printing it with the enlarger or by contact. Having said this, I think that if you bring a photo to a lab in order to print it, if it's in colour, you can be considered the author of the photo but, if the photo is in b&w, there are two authors: the person who taked it with the camera and the person who processed it at the lab.