In order for an OK sheet to be released, a check is run to see whether the tolerances of the selected process standard are complied with. In a production check (production variation = PV), during printing the sheets are no longer compared with this process standard but with the OK sheet. It is not necessary for all of the sheets to be optimal in this comparison. However, in compliance with ISO 12647-2, at least 68% of the print values must be within the defined tolerances. The tolerance for cyan, magenta and black is ±4 for ΔE, only for yellow is a ΔE of ±5 allowed.
A production check is run separately to the conventional analysis but its operation is analogous to it. By default, the first sheet is set as the reference data set. If required, this can be changed like in the conventional analysis (see Reference data set).
You can check production in three different views:
•PV Overview: Statistical overview of overall production
•PV CIE report: Displays solid tint CIELab color values for all color channels in the data series. You can select a single view or any combination of the data.
•PV dot gain report: Displays dot gains or dot gain differences for all color channels in the data series. You can select a single view or any combination of the data.
The "PV Overview" is the main document in the analysis and is a summary of all the results. The other two views, "PV CIE report" and "PV dot gain report", are for in-depth analysis and debugging, especially if the result of the production check was negative. These let you identify and localize an error.