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+Offset printers need separate camera-ready copies for each ink 
+they will use in printing a document.  Aurora is a PostScript 
+program for producing colour separates from a colour PostScript 
+document.  Aurora can be run from any type of computer, as it 
+depends only on a black-and-white PostScript printer for its 
+execution.  It is capable of handling colour images as well as 
+ordinary graphics, though image handling is very slow.
+
+=============================================================================
+CONTENTS
+========
+
+The Aurora distribution consists of the files
+
+README        This file.
+
+aurora        The Aurora PostScript program.
+
+auroratx.ps   A description of how Aurora works, its limitations, and
+              examples showing what it will do.  This document is 
+              suitable for printing on a colour printer, a Level 2 
+              machine, viewing with a PostScript interpreter, or as 
+              a last resort, printing on an old Level 1 machine.
+              The last page, containing several images, is extremely 
+              slow to output.
+
+cyan          These four files allow selection of the primary colour
+magenta       for a particular run of Aurora.  Any colour used in
+yellow        a document will be separated into these components, and
+black         the amount of the selected primary will be output.
+
+red           These three files are examples of how to select custom
+green         colours.  When used with Aurora, only precise matches
+blue          to a custom colour are output (either as full black or
+              as a shade of gray).
+
+60.lpi        When using the CMYK colours, it is useful to set up
+71.lpi        different screens for halftones of the different 
+85.lpi        primaries.  These files contain instructions obtained
+              from the Adobe file server for establishing suitable
+              screens for a desired dot density.  The parameters 
+              used in these files may vary between machines, and
+              you may find it necessary to consult the PPD file
+              appropriate to your machine from the Adobe file server
+              for more suitable numbers for setting colour screens 
+              on your hardware.
+
+=============================================================================
+USAGE
+=====
+
+It is necessary to send to the PostScript printer the file
+"aurora", followed by a colour primary selection, optionally a 
+screen specification, and then the document itself.  With some 
+operating systems, it is best to join (or concatenate) the separate 
+files into one before despatch to the printer.  They must be 
+treated as a single job by the PostScript printer.
+
+This procedure must be followed for each desired separate.  
+
+For example, the files
+   aurora  magenta  60.lpi  mydoc
+would be sent as a single file to the printer to print the magenta
+separate of "mydoc", using a 60 lines per inch screen.
+=============================================================================
+
+Aurora is available by anonymous FTP from "ftp.adfa.oz.au" in
+directory "pub/postscript".  
+
+Aurora may not be used for commercial purposes without the consent 
+of the author.  It may be freely transmitted provided the authorship 
+and copyright notice is retained unmodified.
+
+                                  Graham Freeman
+                                  gfreeman@cs.adfa.oz.au