Shortcomings of FM screening and FM screening

Light and flat net is easy to produce rough and grainy feeling; The halftone dot density is extremely high, and the dot expansion rate is difficult to control; Need high-precision printing equipment and harsh printing conditions; The stability of film output, the reproducibility and clarity of fine dots are higher than those of amplitude modulation dots; When printing, the shallow layer is easy to be lost, and the deep layer is easy to be blocked.