"Calibration" Option
In Prinect Production, "calibration" or "process calibration" refers to the standardization of the screen dot sizes in the whole print process. Screen dots become larger during imaging of the plates (because of scattered light) and printing of the paper in the press. Inaccuracies in the screen dot size result in errors in color reproduction. During process calibration, the dot sizes on each output medium (plate, printing material) are measured using a dotmeter or densitometer and compared with the digital nominal defaults. Calibration curves result from the difference and can be used to correct the digital originals, producing the correct dot sizes on the output media as a result. The calibration data sets for process calibration are created with the "Prinect Calibration Manager" software.
Linearization describes the standardization of the dot sizes during imaging of the plates.
Prerequisite: To be able to enable and set up the "Calibration" step, you must have a linearization and/or process calibration group that contains at least one linearization/calibration data set. In addition, the data sets must be enabled. The data sets for linearization or process calibration are created, set up and enabled with the Calibration Manager. You can launch the Calibration Manager from the Windows Start menu of the Prinect server with "Start > All Programs > HEIDELBERG Prinect Workflow > Calibration Manager".
Note: Information about process calibration, linearization and operation of the Calibration Manager can be found in the Calibration Manager Online Help.
Enable the "Linearization" option if you wish to use linearization and a linearization group when processing jobs with the selected imagesetter.
You must select one of the created groups of linearization data sets in the "Group" list box. The selected group determines the type of linearization that will be applied to the imagesetter output.
Linearization - Rules
This is where you can specify how linearization will be selected and used on the jobs. The names of the calibration data sets or the parameters in the job (screen system, dot size, resolution, etc.) that are compared with the parameters in the data sets of the set group form the basis for selecting suitable linearization curves. You can choose between the following rules:
•Match, else error
The set group is searched for linearization curves that match the parameters contained in the print job. Here, the screening system, dot size, screen ruling, resolution, polarity, orientation and output medium are taken into account. If no suitable linearization is found in the set group, for example, because there are differences in one of the job parameters compared to the parameters of the data sets in the selected group, the job is canceled with an error message.
Note: Make sure that all relevant linearization data sets are enabled; otherwise, they are ignored!
•Match, else use default data record
The group is searched for linearization curves that match the parameters contained in the print job. Here, the screening system, dot size, screen ruling, resolution, polarity, orientation and output medium are taken into account. If no suitable linearization is found in the set group, the default data set that is set in the "default data set" group is used.
•Use default data record
If this option is selected, the "default data set is always used.
Enable the "Process Calibration" option if you wish to use process calibration and a process calibration group when processing jobs with the selected imagesetter.
You must select one of the created groups of process calibration data sets in the "Group" list box. The selected group determines the type of process calibration that will be applied to the imagesetter output.
Process calibration - Rules
This is where you can specify how process calibration data sets will be selected and used on the jobs. The names of the calibration data sets or the parameters in the job (screen system, dot size, resolution, etc.) that are compared with the parameters in the data sets of the set group form the basis for selecting suitable calibration curves. You can choose between the following rules:
•Match, else error
The set group is searched for process calibration curves that match the parameters contained in the print job. The following parameters are taken into account during this process:
•the colors,
•screening parameters (screen system, dot size, screen frequency or dot size, resolution, polarity), output medium and
•the settings selected in the "Process Calibration" section.
If no suitable curve is found in the set group, the job is canceled with an error message.
Note: Make sure that all relevant calibration datasets are activated; otherwise, they are not taken into account!
•Match, else use default data record
The set group of calibration curves is searched for a calibration curve that matches the parameters contained in the print job. If no suitable curve is found in the selected group, the default data record is used.
•Use default data record
If this option is selected, the default data set is always used.
"Calibrate colors not contained in the default data record as if they were" option
If there is no calibration curve in the default data set for a color from the print job, the calibration curve assigned to the default color is used instead.
This is where you can set that colors not contained in the default data set will be calibrated like the color set in the box. For example, if you set "Cyan" in this list box and the job has spot colors, these will be edited with the calibration data for cyan.
"Calibrate colors not contained in the default data record using the spot color record" option
A different data set is used, for example, for spot colors if there is no calibration curve in the default data set for a color from the print job.
You can set a data set for spot colors that will be used to edit all colors not in the default data set. This option requires that there is at least another calibration data set for spot colors in addition to the default data set.
"Process Curve Set", "Press", "Ink Series" list boxes
This is where you select a process standard (your "Calibration Destination") and parameters that describe the printing conditions ("Process Curve Set", "Press", "Ink Series"). More information regarding these parameters can be found in the Calibration Manager documentation.
"Use Process Standard from Job Settings, if available" option
A process standard defined in the job settings is used for output if this option is enabled.
"Use Default Ink Series "HD Default" for Spot Colors" option
If this parameter is not checked, the ink set you set in "Ink Series" is used as the basis for the search for a spot color calibration data set.
When this parameter is checked, the default ink set is used when searching for a spot color calibration data record and not the ink set selected.
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