With this option, you can have the screening of objects set automatically — depending on the object type — for proof pages (where defining a screen system is often forgotten). The screen systems present in the system environment are made available in a "Screenlist.xml" resource file.
Object screening
"Object Type" list box
In this list box, select the object type to which to apply object screening. If you select a different setting to "Default setting", you must enable the check box before the "Object Type" list box to enable object screening. You can choose between the following object types:
•Default setting: All objects that occur in the PDF documents
•Images: All pixel images
•Bitmaps: All bitmaps (graphics where only area coverages of 0% and 100% occur per separation)
•Graphics: All vector graphics
•Gradients: All shadings
•Text: All text objects
"Screen System" list box
Prerequisite: Some of the screen systems mentioned below require special licenses. For that reason, it is possible that the Cockpit you are working does not offer all the screen systems mentioned.
Note: The following tips are valid for "Document Controlled Screening", "Hybrid Screening", "Stochastic Screening starter", "Stochastic Screening medium", "Stochastic Screening fine", "Stochastic Screening super fine", "Stochastic Screening II medium", "Stochastic Screening II fine", "Satin medium" and "Satin fine" screen systems:
•"IS Screening" (all variants)
The frequency and the dot size are relevant for amplitude-modulated "IS Screening". The "Line Frequency" and "Feature Size" list boxes are enabled.
•"Hybrid Screening"
The frequency and the dot size are relevant for amplitude-modulated "Hybrid Screening". The "Line Frequency" and "Feature Size" list boxes are enabled.
•"HQS Screening" (all variants)
Only the frequency is important for amplitude-modulated "HQS Screening". The "Line Frequency" list box is enabled.
•"RT Screening" (all variants)
Only the frequency is important for amplitude-modulated "RT Screening". The "Line Frequency" list box is enabled.
•"Diamond Screening"
Only the dot size is important for frequency-modulated "Diamond Screening". The "Feature Size" list box is enabled.
•"Satin" (all variants)
The dot size is important for the "Satin" frequency-modulated screening method. The "Feature Size" list box is enabled and the "Line Frequency" boxes disabled.
•"Stochastic Screening" (all variants)
The dot size is important for frequency-modulated "Stochastic Screening". The "Feature Size" list box is enabled and the "Line Frequency" boxes disabled.
•"Megadot Screening" (all variants)
Only the frequency is important for amplitude-modulated "Megadot Screening". The "Line Frequency" list box is enabled.
•You can also set the dot size for "IS Classic" like for "Hybrid Screening" if the "Hybrid Screening" license option is enabled.
"Dot Shape" list box
In this list box, you set the screen dot shape that will be used for the screen system you selected.
"Frequency" parameter
In these list boxes, you can select one of the screen frequencies (in lines/inch or lines/cm) that are presented for the selected screen system.
"Feature Size" parameter
The feature size (dot size) is relevant for frequency-modulated screens (see note on this above).
Note: The "Feature Size" parameter is not a calibration parameter. This means that calibration data records cannot be differentiated solely on the basis of different dot sizes. This affects calibration of the "Hybrid Screening" and "IS Classic" screen systems if these are selected in output sequences with different dot sizes but otherwise the same parameters. You must create different calibration groups for linearization and for process calibration if you are going to use different calibrations whose only difference is their dot sizes. These calibration groups must contain the calibration data records that are required for the various dot sizes.
In the right part of the "Object Screening" window, you can define settings for angle substitution for amplitude-modulated screen systems.
With the help of the angle substitution functionality, you can assign new screen angles to the process colors (cyan, magenta, yellow and black) and to spot colors. In other words, the angles set in the job documents are changed to new angles that you define in this section when they are output. In addition, you can assign screen angles to spot colors.
The colors currently assigned to the angles display in the Angles (*) box.
Assign angles
Note: Take note of the following items when you use the 'assign spot color to screen angle' function:
Each of the four process colors (cyan, magenta, yellow and black) and the spot colors have their own list box with the four process colors. To assign another angle to a color, select the process color that is linked to the angle you want in the list box.
Example: You want to assign a different angle to magenta. The default system angle for magenta is 45° in the IS Classic" screen system. If you select "Cyan" in the list box beside "Magenta", magenta is output using the screen angle for cyan, in other words at 165°. This angle displays in the "Angle (*)" box beside the list box.
To prevent different process colors from being output with the same screen angle, you must assign other screen angles accordingly so that each color is assigned its own screen angle.
A comparison with the default screen angle that is shown in the "Angles (*)" box makes it easy for you to reconstruct which substitute angle is set.
Note: Spot colors which only differ by the ending in the name are treated as one color. Example: No difference is made between the colors "PANTONE 165 C" (coated) and "PANTONE 165 U" (uncoated) and they are assigned to the same angle.
Note: Take note of the following items when you use the 'assign spot color to screen angle' function:
•The names of the spot colors are irrelevant in the assignment of angles. The angles are assigned if the spot colors occur in the document.
•Process colors must not be set for angle substitution if duotone and tritone images are to be processed together with process colors.
•Only the cyan and magenta angles may be used for spot colors if duotone and tritone images that have black are to be processed!
•Do not use any fine screens in conjunction with the spot color-to-angle assignment. This can cause problems with yellow and black.
•Process calibration may not be correct if you use the 'assign spot color to angle' function.
•The angle defaults for spot colors are also affected by the assignment of angles. The default angle is that of the color Black.
"Filter" group
This is where you specify the screen parameters to be displayed or released in the "Object Screening" area. In this way, you can, for example, filter out only those settings that affect the imagesetter intended for object screening and/or only the resolution intended for this. The "All" setting cancels this filtering in each case.
Screen system settings
Usually, the file "Screenlist.xml" is specified here. This file records the screen systems available in the system environment. If another file with object screening settings is available — such as those created with the Screening Selector (part of Prinect PDF Toolbox) —, you can click "Browse" to select a file in the file system and load it as presetting.
"Imagesetter" parameter
In this list box, select the imagesetter on which to output the object screen.
"Resolution" parameter
This is where you set the imagesetter resolution (in dpi) for the screen that will be created.
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