additive colour film

Additive color film is a type of color photography that uses a filter raster of red, green, and blue transparent lines. Light passes through these lines before reaching a black-and-white emulsion layer. The emulsion is processed to create a positive image where different colors are represented by the transparency of specific filter lines. For example, red subject portions leave the red filter lines transparent, while blocking green and blue. Yellow subjects, a combination of red and green light, leave both red and green filter lines transparent. The eye perceives an additive impression of the color when viewing the transparent filter elements. This process is primarily used in rapid-access diffusion-transfer systems. Additive color mixing, fundamental to the RGB color model, involves combining beams of light. The primary additive colors are red, green, and blue, which can be mixed in varying amounts to produce almost all other colors, including white when combined equally.123