A study of the need for color controls on color TV receivers in a color TV system operating perfectly

Color television pictures consist of black-and-white pictures to which color information is added in the form of "hue" and "saturation". A complete investigation of the need for controls to adjust "hue" and "saturation" (usually called chroma) therefore requires a careful study of possible errors in the whole color TV process from the original scene to the human brain. Even if all the vagaries of picture generation, transmission, and viewing were exactly controllable, it might be economical and desirable to provide such manual controls to compensate for small variations in the color TV process, thereby permitting wider tolerances in the many steps required to produce good color pictures.