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authorKarl Berry <karl@freefriends.org>2006-01-09 00:43:17 +0000
committerKarl Berry <karl@freefriends.org>2006-01-09 00:43:17 +0000
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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