Calibration and Linearization Settings
This part elaborates on the different settings for creating and editing Calibration and Linearization curves. The creation and editing process for Calibration consists of a series of dialog boxes eventually followed by the Curve Editor.
•In the second dialog box, you need to specify how you are going to enter the necessary values to calculate the calibration curve. See
“Create Table”.
•If you have chosen to create your table manually, you need to select the number of Stimuli values or measuring points to specify the accuracy of the calibration curve. See
“Stimuli Selection”.
•In the Wanted settings dialog box, you have different options for the Measured and the Wanted values. See
“Wanted Selection”.
•Finally, you enter the Curve Editor from where you can print a test page or where you can enter the Measured and Wanted values. See
“Curve Editor”.
NOTE: The settings for Simulation are almost identical to those for Calibration and Linearization. Simulation has no Measured values and therefore no options for them.
Calibration Print Settings
Opens the print job details regarding stock and screen type.
Printing Stock
Paper type
Select a paper type from the drop-down list.
Ink set
Select an from the drop-down list. The drop-down list shows all of the available Ink Sets in the Ink Sets Resource category.
Screen
The screen polarity is taken from the selected Press.
Positive/Negative
Specify the polarity.
Halftone Screen
Select the screening details from the various drop-down lists:
Screen
Apogee Balanced Screening, Adobe Accurate, and Rational Tangent (for more information on the screen types, see
“PDF Render - Screen Settings”).
Resolution
Choose a resolution.
Frequency
Choose a line frequency.
Dot shape
or round.
Linearization Print Settings)
This dialog box contains the print job details regarding surface and screen type.
Media Type
Select the appropriate medium from the drop-down list.
Workflow
Specify the polarity of the print job by selecting the appropriate check box:
•Positive
•Negative
Halftone Screen
Select the screening details from the various drop-down lists:
Screen
Apogee Balanced Screening, Adobe Accurate, and Rational Tangent (for more information on the screen types, see
“PDF Render - Screen Settings”).
Resolution
Choose a resolution.
Frequency
Choose a line frequency.
Dot shape
or round.
Create Table
In this dialog box, you specify how you want to initialize the values table. The values table contains the Stimuli, Measured and Wanted values.
Depending on the type of , you will either have to enter the Measured values manually or import them from a file that is generated by the densitometer. You can also import an existing curve, created in an external application.
Manually
Select this option if you want to type the values manually in the table. This means that you will have to enter the values based on the measured results of the test page.
Import from File
Select this option if you want to import the values from a specific file.
You can import:
•an existing curve that was created in an external application and saved as an ASCII file
•a curve from an older version of Calibrator (not for Linearization).
NOTE: Apogee warns you when it does not recognize the file format.
Stimuli Selection
In this dialog box, you specify how many Stimuli values (in dot percentages) you want for the table and the curve. The number of Stimuli values determines the accuracy of the curve. An accurate compensation curve will result in an accurate calibration of your output device.
You have the following options:
Standard 3
Select this option if you want the three standard values from 0 to 100: 0, 50 and 100.
Standard 13
Select this option for the 13 standard values: 0, 5, 10, 20,... 90, 95, 100.
Standard 21
Select this option for the 21 standard values: 0, 5, 10, 15,... 90, 95, 100.
Standard 31
Select this option for the 31 standard values: 0, 1, 2, 3, 4, 5, 6, 10, 15, 20,... 85, 90, 94, 95, 96, 97, 98, 99, 100.
0 to 100 Steps
Select this option if you want to enter the number of Stimuli values yourself.
Wanted Selection
In this dialog box, you define the Wanted values.
Wanted Values
Linear
Select this option if you want the Wanted values to be the same as the Stimuli values. This option will result in a linear curve.
Simulate dot gain
Select this option if you want the Wanted values to correspond to a certain . You can use this option if you want to calibrate your output device to produce a certain dot gain and not to compensate the dot gain.
Compensate for dot gain
The Wanted values will compensate for the specified dot gain.
Dot gain
Type the dot gain percentage for which you want the Wanted values to compensate.
Highest dot gain at
Specify the stimuli for the highest dot gain.
NOTE: For Linear curves, only the Linear option is available.