Separation images are produced by capturing photographs on materials or with equipment that is sensitive to specific regions of the visible spectrum-typically red, green, or blue. Each image records only one component of the colour information, which can later be combined to reconstruct a full-colour photograph.
This technique, known as colour separation, is fundamental in early colour photography, printing, and modern colour reproduction processes. By isolating and then recombining these colour channels, photographers and printers can achieve accurate colour rendering and maintain fine detail in the final image.