PURPOSE: To improve reproducibility of a color and marking by printing printing colors on one or more blank films according to a corresponding position of a pixel.

CONSTITUTION: Reference points are dispersively disposed on an overall surface of a test blank to be effected by an influence at the time of a molding product. And, changes of number of the points and positions of arbitrary spots on a surface at the time of molding in the case of dispersing are decided to be measured by comparing emitting the position to the plurality of the points. A decoration of a block is converted into pixels of printing colors. And, positions of the pixels are collated with respect to the points on the test blank. Corresponding positions are collated to the points on the blank, and the colors are printed according to the corresponding positions of the pixels on a blank film. Thus, reproducibility of the color and marking can be improved.