However, different brands, different specifications of ink, printed on different substrates, the field density can be achieved are different, the dot expansion is also different. Therefore, in actual production, it is necessary to determine the best on-site density and appropriate dot gain values ​​for different substrates and different inks.
The method for determining the optimum solid density and dot gain using printing contrast is discussed here.
Print contrast or K value refers to the contrast between solid density and dark density (mainly 75% or 80% density). The greater the print contrast value, the more layers it can reproduce, and the richer the details of dark tone; conversely, the smaller the print contrast value, the less the level it can reproduce. Its calculation formula is:
In the formula, Ds is the solid density value (which can be paper-containing or minus paper density) and Dt is 75% or 80% density value (which can be paper inclusion or minus paper density).
It can be seen from the formula that if the Ds value of a printed matter is as large as possible and the Dt value is as small as possible, the print contrast can be maximized.
Of course, if Ds and Dt are directly measured and then calculated, it is more complicated, so the general optical densitometer has the function of directly measuring the print contrast.
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