52 cm-1 to 70 cm-1 for continuous-form process printing on coated paper, 52-1 FOR UNCOATED PAPER
60 cm-1 and higher for commercial/speciality printing
NOTE 1 Outside of the range 45 cm-1 to 80 cm-1 the general principles specified in ISO 12647-1 remain vaild but sperific values might differ
NOTE 2 With computer-generated screening , the "screen frequency " is often varied slightly from one process color to another in order to minimize moire patterns. For example, there are might be a difference of 3 cm or 4 cm between the color C,M,Y
Note 3 For the black or yellow color half-tone, a screen ruling is sometimes used which is substantially finer than the nominal screen ruling of the remaining colors, for example, 84 cm versus 60 cm