Color Laser Shield (CLS) technology is used for printing personal photos on ID cards as a measure of security. The tasks within this internship are to define a standard way to measure colors, guarantee their consistency, and optimize an approach to obtain the best colors possible within the available materials and equipment. A standard way of measuring colors was defined, based on the CIE 1964 L*a*b* color space values, using a spectrophotometer. But the spectrophotometer can measure only a large spot of one uniform color (i.e., it can’t measure all color details of a picture). A flatbed scanner, calibrated with the spectrophotometer as reference, has therefore been used.