The principle of color film imaging

The principle of color film is the principle of light subtraction (color reduction). The principle of color reduction of light is also called the principle of light filtering, which is defined as: from the white light to reduce the area of one or several kinds of color light, and get a new color light phenomenon is called the filtering of light. We can think of white light is red, green, blue light composed of complex color light, red, green, blue light added to get white light, which is the basic principle of the three basic colors. Color film base coated with a sense of red, green, blue light-sensitive layer, light-sensitive after processing to generate green, magenta, yellow transparent dyes, respectively, blocking red, green, blue light, if the sense of the white light, white light in the red, green, blue light is blocked all the way into the black, if only the sense of the red light film only generates a green dye. Scenery is red flowers, green leaves, blue background, the negative generated cyanotype, red leaves, yellow background, the negative printed into a positive film becomes red flowers, green leaves, blue background. The color of the negative and the color of the scene is a complementary color relationship, the negative and positive film is also a complementary color relationship. That is, red and green complementary, green and Pin complementary, blue and yellow complementary. Because of this, the full name of the color film is subtractive multilayer color film.