DIGITAL PROOFING -- Taking Measure of a Proof

A true virtual proofing system requires implementing a calibration method for RGB displays to ensure consistency between any two monitors. Achieving an accurately calibrated system requires use of a precision measurement device. The requirement for the emissive color measurement device used is a repeatability of ±0.1 delta E and an absolute accuracy (versus the primary standard) of ±0.5 delta E for all color values. However, most low-cost emissive colorimeters and spectrophotometers commonly vary from each other by ±2 delta E or more.