For the first forty years after a practical process of capturing and reproducing images was invented, photography remained the domain of a highly dedicated group of individuals who had expert knowledge of and skills in science, mechanics and art. To make a photograph, a person had to learn a great deal about chemistry, optics, light, the mechanics of cameras and how these factors combine to properly render a scene. It was not something that one learned easily or engaged in lightly, and, as such, it was limited to a relatively small group of academics, scientists and professional photographers.