You may want to be able to specify document screening in your creative programs, and have these settings respected by Prinergy and Prinergy Evo.
The main reason for using embedded document screening is if you want to automate hot folder workflows to avoid having to stop the process to intervene and manually specify spot color screen angles. This is very common with Prinergy Evo workflows. By defining angles in the original files and selecting Use Document Screens if Present in output process templates, your input files can be dropped into hot folders and screened automatically, with complete control over all spot color angles.
Prinergy and Prinergy Evo respect embedded PostScript screening commands in original files, but the following factors must be considered:
- The Prinergy angle coordinate system
- The screening angles supported by Prinergy
- Dot shapes supported by Prinergy
Prinergy angle coordinate system
The first factor to consider is that Prinergy uses an angle coordinate system that positions 0° at 12 o'clock and measures clockwise. PostScript, on the other hand, uses an angle coordinate system that positions 0° at 3 o'clock and measures counterclockwise.
Prinergy will always consider embedded screening commands to use the PostScript convention, and will always translate those to Prinergy angles. This means that you must first determine which angles you are going to use in Prinergy, then work backwards to determine which angles will be specified in art creation programs such as Macromedia FreeHand or ArtPro software. For example, if you want to use a Prinergy 22.5° angle, then you must specify 67.5° in the art-creation program.
Screening angles supported by Prinergy
The second factor to consider is that Prinergy document screening only supports the following angles: 0°, 7.5°, 15°, 22.5°, 37.5°, 45°, 52.5°, 67.5°, 75°, 82.5°, 90°. When Prinergy detects embedded document screening, it will normalize all angles to the 90° quadrant. For example, a document screening angle of 135° will be normalized to 45°, or an angle of 202.5° will be normalized to 22.5°.
Documents can have any or all of these screen angles defined at one time, so it is possible to have up to 10 angles on one surface.
See Also