Dickeson--Print Communications Made Easy

Digital proofing, Lyman tells us, relies on the CIElab model for defining color values. The "l," "a" and "b" refer to coordinates for hue, saturation and brightness. CIE is the Committee for Illumination that defined the three-dimensional color space in 1931, Lyman explains. This enables matching some 1,800 points between color proof and press sheet, using the robotized spectrophotometer.