Black and white photography was the first form of photography to be invented over 150 years ago, and has remained popular since then for its aesthetic and artistic properties. Traditional black and white photography is more or less is the result of monochromatic, light-sensitive chemicals on some sort of medium such as film or plates. Some chemicals respond to different colors of light more than others. A combination of light color and film selection with black and white photography produce different effects when the colors are represented in monochrome. That is, if a film that was hypersensitive to red, it would have bright white areas if the light source was originally red. Traditionally, photographers had to choose a type of black and white film to whatever effect he or she was going for, and if he or she had control over lighting, would adjust lighting according to the film. Some photographers still prefer this method because of the limitation of digital cameras
When using a digital camera, a photographer obviously does not have the option to choose a type of film for a desired effect. Most cameras only have one sensor, so this requires that either the camera convert to image to a monochrome image, or the photographer convert in in post-processing. Some cameras have options when converting images to black and white, but for the most control, shooting and saving an image in a RAW format gives the photographer the maximum number of options when post-processing.