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Adobe Illustrator ™ - Macintosh ®Editing Line Screens in a PPD File

IP.com Disclosure Number: IPCOM000128770D
Original Publication Date: 1994-Jan-01
Included in the Prior Art Database: 2005-Sep-19
Document File: 2 page(s) / 78K

Publishing Venue

Software Patent Institute

Related People

Adobe Systems Inc.: AUTHOR [+3]

Abstract

PostScript ™ Printer Description (PPD) files contain information about the capabilities and characteristics of each type of PostScript printer, including the page sizes the device can output and some of the screen angles and frequencies the printer supports. Many PPD files are included with Adobe Illustrator in the PPD folder.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

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THIS DOCUMENT IS AN APPROXIMATE REPRESENTATION OF THE ORIGINAL.

Copyright ©; 1994 Adobe Systems, Inc. All Rights Reserved. Reproduced with permission. Adobe makes no warranty as to the accuracy or completeness of this material and hereby disclaims any responsibliity therefor.

Adobe IllustratorTM- Macintosh ®Editing Line Screens in a PPD File

PostScript TM Printer Description (PPD) files contain information about the capabilities and characteristics of each type of PostScript printer, including the page sizes the device can output and some of the screen angles and frequencies the printer supports. Many PPD files are included with Adobe Illustrator in the PPD folder.

The Adobe Separator TM program uses the information in PPD files during the printing process. When you start the Adobe Separator program for the first time, you are prompted to select a PPD file. For best results, you should use the PPD file that corresponds to your output device.

The line screen angle and frequency combinations provided in the PPD files are designed to eliminate moir patterns during printing; however, depending on your artwork, you may occasionally want to adjust the line screen angle and frequency combinations.

In Adobe Separator 5.0.1 and higher, you can edit the screen angle and frequency information of the PPD file in the application to change the screen angle and frequency; in earlier versions of Adobe Separator, you need to edit the PPD file using a text editor.

Tip: If you own Adobe Photoshop TM , you can use the Screen function in the Adobe Photoshop Page Setup dialog box to compute angle and frequency combinations. These combinations may then be used to edit the appropriate PPD file.

To edit the line screen information in a PPD file:

1 Using any text editor, open the PostScript Printer Description (PPD) file that corresponds to your printing device. If you do not find the PPD file that corresponds to your printing device in the PPD folder, contact your printer manufacturer.

2 Near the end of the file, search for a group of lines that are similar to the following: *% For 132 lpi / 2540 dpi *ColorSepScreenAngle ProcessBlack.132lpi.2540dpi/132 lpi / 2540 dpi: "45.0" *ColorSepScreenAngle CustomColor.132lpi.2540dpi/132 lpi / 2540 dpi: "45.0" *ColorSepScreenAngle ProcessCyan.132lpi.2540dpi/132 lpi / 2540 dpi: "18.4349" *ColorSepScreenAngle ProcessMagenta...