EPS

An EPS (encapsulated PostScript™) file contains PostScript language commands which describe the appearance of a single page. The commands in an EPS file generate 2D graphic information in the form of text, vector graphics and pixel images. Vector shapes may be lines, arcs or bezier curves. Connected paths can be constructed using those basic shapes. Paths can be drawn with different line styles and line thicknesses. Closed paths may be filled with a solid color or predefined patterns. Typically, the purpose of an EPS file is to be included, or “encapsulated,” in another document. That is, when an EPS file is included in a document, the content of the EPS file is not interpreted and translated to the graphic format of the including document, but a direct copy of the commands in the EPS file is included. When the document is printed on a PostScript compatible output device, such as a PostScript Laser Printer, the encapsulated PostScript commands are executed by the device and they will generate the graphic information as it is described in the initial EPS file. EPS files may contain a preview image. A document including the EPS file is able to show the content of the EPS file by displaying the preview image. However, the final content of the included EPS file usually cannot be revealed until the document is printed.

 

 

Exporting EPS files

export_opts_eps.tiff
The Export Options: EPS dialog.

The content of a form•Z window is exported as an EPS file by executing the Export Image command (File menu), which invokes the Save dialog and then the Export Options: EPS dialog. This dialog contains a few format specific options.

 

Saving as an EPS file exports the content of the active window. When a modeling window is active, the 2D image displayed on the screen is exported, rather than the 3D representation of the modeling objects. How the exported image is represented in the EPS file (vector or pixel data) depends on the type of display that is on the screen. Hidden line images are exported as vector lines. Other renderings are exported as pixel images.

 

When a modeling scene is exported as vector lines, the line thickness is determined by the active Line Weight option in the pull down menu of the Export Options: EPS dialog. All lines are exported as solid lines.

 

When a modeling scene is exported as pixel data, the maximum number of colors in the pixel image is determined by the Image Color Depth selected in the Image Options dialog, invoked from the Display menu. For example, if 8 bit (256) is selected in the Image Options dialog, the pixel image can contain up to 256 different color values. When a scene is exported as vector data, the color information of an entity exported to an EPS file is determined by the red, green and blue values of the color attribute of the respective object, face or drafting element, regardless of the current Image Color Depth setting.

 

The modeling underlays that are produced from image formats cannot be described by EPS commands. Therefore, these entities are not included in the graphic information of an EPS file.

 

Write Black As: One of the three available items can be selected from this pull down menu:

RGB: When this item is selected, black is exported as red=o, green=0, and blue=0.

 

Gray: When this item is selected, black is exported as gray=0.

 

CMYK: When this item is selected, black is exported as cyan=0, magenta=0, yellow=0, and black=1. This option is only available when PostScript Compatibility is set to Level 2.

Which option is selected may be significant when producing plates for color printing and black need to be generated as a spot color. In such cases, the CMYK and Gray options usually work best.

 

Postscript™ Compatibility: When the Level 1 option is selected, the EPS file can be printed on a Postscript device which only supports Postscript Level 1. Postscript Level 1 does not support color images and hatch patterns. Level 1 files are supported by Level 2 devices but Level 2 files cannot be printed on Level 1 machines. The default option is set to Level 2.