The Rosco CalColor #4415 Green Filter (0.5 Stop, 24"x25' Roll) is designed specifically to the spectral sensitivity of color film. This filter color is designed in 15 density, corresponding to the familiar ½ stop calibration. In color photography, three light-sensitive emulsion layers separately record the individual blue, green and red components of the spectrum.
CalColor filter adjusts the transmission of these color components at the individual light source in a familiar and reliable manner. As a result, the cinematographer can exercise selective and predictable control over the image's coloration as rendered by the film.