Abstract: A periodic line pattern, which is covered by a periodic lens structure of cylindrical lenses parallel to the lines of the line pattern, is imprinted on a substrate. The period of the lens structure corresponds with the period of the line pattern. The lenses preferably are aligned flush with the lines of the line pattern. The lines consist of paths of elementary printing dots or image dots (pixels). The number of paths of elementary printing dots in one period is at least 4 and not more than 16. The height of the cylindrical lenses at the apex is at least half the width of a period and not more than the width of a period of the line pattern. With advanced offset printing methods, which are employed for instance in safety printing (e.g. for banknotes), a printing resolution of about 4 ?m is achieved. Preferably, the elementary printing dots are chosen only a little larger than the achievable printing resolution.