The large white and black patches are used to evaluate the full tonal range. The white patch in the LAD Control Film scene is 90% reflectance and the black patch has 2.5% reflectance, which approximates to the range of reflectance found in most scenes. The unlit black plush area behind the girl's head provides a true shadow reference. There is sufficient flesh area for densitometry and evaluation of the flesh tone. The three colour patches (blue, green, red) are included to add a little colour to the scene and to help identify any colour separation exposures that might be made. The small grey scale at the bottom of the scene is used for subjective evaluation of grading and reproduction and can be used to objectively set the gamma controls on an electronic colour analyser.