n Value for General Conditions.

The dot area of a halftone printing dot on paper can be calculated by the Yule-Nielson equation. When the value of n in this equation equals 1.0, the equation reverts to the Murray-Davies equation. This equation gives a general solution independent of screen ruling and substrate. It is shown that for a wide range of general conditions an n value between 1.4 and 1.8 significantly increases the accuracy of dot area calculations over an n value of 1.0. Therefore the choice of an n value between 1.4 and 1.8 can result in improved accuracy of dot area calculations for most practical conditions and is feasible for those cases where other values does not already exist. For practical reasons a specific value of 1.7 is recommended.