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 EPS Files

Postscript Images from JETDSP

JETDSP provides 3 mechanisms for exporting PostScript format (EPS) files:

  • Standard EPS file creation using your own preferences (Export)
  • Pixel reduced format EPS using your own preferences (Reduced EPS)
  • Publication formatted EPS file (Export for Publication)
These options are available from the 'File' menu of the plot window:


Standard EPS File Creation

By default this option produces a high resolution PostScript view of the current plot window. The PostScript engine uses a default reduction factor of 4:1, meaning that for every 4 data points in the original signal(s) 1 is plotted in the image. This can lead to very large image files (2.5 million points = 40MB) which are difficult to store and even more difficult to manipulate within graphics packages used in the journal publication process.

Although the default reduction value is 4:1 it is possible to configure the actual reduction value used. This can be set by modifying the 'PSPIXELSCALE' attribute in your .jetdsprc file. The larger the number specified for this parameter the greater the data reduction will be, a value of 100 results in every 100 data points being plotted as a single point in the PostScript image. The higher the value the higher the likelihood of features in the data being lost, so carefully check your results if this value is changed.

The 'Pixel Reduction' option in your graphics preferences must be enabled for this to take effect.

NB: after changing the value of 'PSPIXELSCALE' you must restart your JETDSP session. Once changed the value does not automatically revert to its default state.


Reduced Format EPS File Creation

This option provides a best case scenario for automatically producing reduced size PostScript files while retaining the original shape of the data as far as possible. It uses a reduction factor of 20:1, resulting in the following savings:
  • Non-reduced EPS file based on 2.5 million data points = 40MB
  • Reduced format plot based on 2.5 million data points = 16KB

For smaller signals the reduction results in the original plot shape being lost so a threshold value of approx. 10,000 points is required before the reduction algorithm begins. Custom annotations, lines, legends, etc. added by users are unaffected by the reduction and will appear as normal.

The 'Pixel Reduction' option in your graphics preferences must be enabled for this to take effect

NB: Interaction between this reduced format export and error bar functionality is currently untested


Publication Format EPS File Creation

This option provides EPS output which is optimised for the using in publications. The above pixel reduction is also applied by default to this type of EPS file. Several formatting options are used by default and override preferences such as font face and size.

This export method is preferred if you plan on submitting a plot to the publications service for a journal or paper.

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