The transmitted colors, or those allowed to pass, are the same as the original colors, just not as intense. In the photographic process, subtractive colors are used to create color. The use of filters is basic to the understanding of how photographic film and paper are designed to reproduced the colors of the subject. Red light is allowed to pass or be transmitted through while the green and blue light are blocked or absorbed. Green light is transmitted through while the red and blue light is absorbed.
Blue light is transmitted through while the red and green light are absorbed.
Referring to the color triangle will help keep the color relationships straight for you. It is important to mention here that so far we have been discussing filters that are ideal, or perfect, meaning they absorbe the complimentary color completely. In reality, this is not so. However, it should be noted that the change in intensity will not create a problem. One must remember that we are dealing with PURE colors.