Controlling the color register is a fundamental part to achieve a high and constant printing performance. The color register determines the overlay of the different printing colors in the printing process. Thereby the colors Cyan, Magenta, Yellow and Key (black) – CMYK – and special colors are printed sequentially. A flawless printing performance depends significantly on how well the colors overlay each other. This can only be achieved by a correctly adjusted color register. Considering this fact it gets clear that color control without a previous register control is almost useless. If the register is not adjusted correctly this will result in a diffuse, blurred or in the worst case, completely illegible print. Concluding we can say that color register measurement is the primary basis for successful printing.