There are three basic vector, or object, export formats available in ArcMap: EMF, EPS, and AI. CGM is also a vector format, but it is rarely used in print design and won't be discussed here. For the simple map of Joshua Tree, the sizes of the vector files shown below are much smaller than the sizes of the raster files you saw in the previous concept. The EMF file has a size of 42 KB, the EPS is 129 KB, and the AI file is 162 KB. Recall that raster files of comparable quality topped out at over 24 MB. The simplicity of the source map is key. An elaborate map with many small features and numerous labels could easily produce a larger vector export. EMF (Enhanced Metafile) is a multi-purpose vector format native to the Windows operating system. When exported to an EMF file, the example map did not fare well. Notice below that the type was shifted relative to the lines. EPS (Encapsulated PostScript) is a common and fairly generic high quality vector format. Unfortunately, with EPS, type is exported in segments rather than complete text strings. Notice below that the 'rk' in Park can be selected, the label has been broken into four segments. If you needed to edit or restyle the type, the segments would overrun each other or gaps would appear between them. The EPS export format is therefore not a useful option for maps in which type quality is important for final publication. In the example above, the letter spacing used for 'MOJAVE' did not export, so the type is not registered with its halos. Despite the problems with halos and letter spacing, the AI format will be the most trouble-free for publication. You should be aware that some custom type effects do not export well, therefore, you should always test your choices before relying on them for a design that will need to move beyond ArcMap. The example below reflects a variety of design changes that were made in Illustrator to the AI file. Line widths, colors, and textures (dashing) were changed. The background color was lightened. The type was changed to a different font and some labels were resized and colored. Letter spacing was reapplied, and note that the green lines break before intersecting with the letters. Additionally, halos around the type were added using fonts rather than drawings (for a smaller file size). The halos around MOJAVE are light in color so you can see them, and the halo is the same color as the background around the large 'J' on the right. The matched halo color is the more usual and more subtle application of this design effect. In the three graphics above, the halos for the MOJAVE label are line drawings, so the black letters do not register with their halos. This characteristic of halos is common to all the vector formats described here (EMF, EPS, and AI). Concepts Overview of export choices Raster export formats Vector export formats Distributing maps on the Web Source.

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Last Modified: April 25, 2016 @ 10:08 pm