summaryrefslogtreecommitdiff
path: root/Build/source/texk/dvipsk/contrib/volker/README
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/texk/dvipsk/contrib/volker/README')
-rw-r--r--Build/source/texk/dvipsk/contrib/volker/README149
1 files changed, 149 insertions, 0 deletions
diff --git a/Build/source/texk/dvipsk/contrib/volker/README b/Build/source/texk/dvipsk/contrib/volker/README
new file mode 100644
index 00000000000..f2138917eda
--- /dev/null
+++ b/Build/source/texk/dvipsk/contrib/volker/README
@@ -0,0 +1,149 @@
+NOTE S Rahtz 1998/01/18: renamed files to suite 8+3 <name>.cfg style
+********************************************************************
+
+Release 1.13, 21 Aug 1995
+Release 1.12, 02 Mar 1995
+Release 1.0, 20 Feb 1995
+
+This is a set of files which can be used with dvips to control certain
+parameters of the printer, like simplex/duplex printing, or screen
+frequencies of images.
+
+Put together by Volker Kuhlmann, VOLKER@ELEC.CANTERBURY.AC.NZ.
+No copyright. Freely distributable. If you make additions, please send
+me a copy.
+
+
+LIST OF FILES
+=============
+
+README This file.
+config.* Configuration files and header files for dvips. Special
+ format which serves both purposes.
+
+
+INSTALLATION
+============
+
+Copy these files into a directory which is searched by dvips both for
+configuration files and for header files. dvips looks in $TEXCONFIG for
+configuration files, and in $DVIPSHEADERS for header files. For details
+please see the dvips documentation.
+
+
+USAGE
+=====
+
+dvips reads the instructions in a configuration file <configfilename>
+with the -P option:
+
+ dvips -P <configfilename>
+
+All these configuration files contain the PostScript code for the
+respective operation as well, and can be used as header file as they are.
+
+Now to the stuff provided:
+
+-P simplex On a duplex printer, force printing in simplex mode. On
+ a simplex printer, this will be ignored.
+-P duplong On a duplex printer, force duplex printing with binding
+ on the long edge. On a simplex printer, this will be
+ ignored.
+-P dupshort On a duplex printer, force duplex printing with binding
+ on the short edge. On a simplex printer, this will be
+ ignored.
+-P a3 Print on A3 paper.
+ Note: this is just a demo - use "-t a3" instead!
+-P inv Print all pages inverted, i.e. white letters on black
+ background.
+ Note: this currently does not work properly. Any
+ hints/fixes greatly appreciated!
+-P screenN Print images with a screen frequency of N lpi at
+ 45 degrees.
+ N = {70, 80, 85, 90, 100, 110, 120, 130, 140, 150}
+-P screen100-0 Print images with a screen frequency of 100lpi
+ at 0 degrees.
+
+Note: When working with screen frequencies, it is possible that
+ turning the printer off and back on solves the problem of the
+ screen commands not having any effect.
+
+
+CONTROLLING SCREEN FREQUENCIES
+==============================
+
+Various PostScript commands for controlling the screen frequencies of
+images exist, but not all work on all printers. See fragments of
+PostScript code and comments below. The form working on most printers is
+
+ LPI DEGREES {FUNCTION} setscreen
+
+Insert numbers for LPI and DEGREES, and a function for FUNCTION about
+which I only know (right or wrong?):
+
+ "Should read 2 values from the stack (x, y coordinates in a
+ halftone cell), and return one in the range -1 to 1. The return
+ values determine the order in which pixels within a halftone
+ cell are whitened to produce any desired shade of gray."
+
+The simplest function is {pop}, creating a "linescreen" pattern. There
+is also a function "Dot" (currently used) and "Ellipse". For any other
+frequencies/angles/functions put the instructions in a file, and load
+the file with
+
+ dvips -h <filename>
+
+Thanks to osakari@unda.fi (Olavi Sakari) for some help, and the "Dot"
+and "Ellipse" code.
+
+Notes follow:
+
+
+%currentscreen 3 1 roll pop pop 70 45 3 -1 roll setscreen
+% Works on HP LJ3Si, HP LJ4m. Ignored on HP LJ4mv (VK).
+
+
+%currentscreen 3 1 roll pop pop 70 45 3 -1 roll sethalftone
+% Ignored on HP LJ4mv (VK).
+
+
+%70 45 {pop} setscreen
+% Produces a funny, 1-diagonal pattern ("linescreen") on HP LJ4mv (VK).
+
+
+% "Dot":
+%70 45 {abs exch abs 2 copy add 1 gt {1 sub dup mul exch 1 sub dup mul add 1
+% sub }{dup mul exch dup mul add 1 exch sub }ifelse} setscreen
+% Works on HP LJ3Si, HP LJ4m, HP LJ4mv (VK).
+
+
+% "Ellipse":
+%70 45 {dup 5 mul 8 div mul exch dup mul exch add sqrt 1 exch sub} setscreen
+% Works on HP LJ4mv (VK).
+
+
+%70 45
+%<<
+% /HalftoneType 1
+ % 0 gives range check error, 2 gives undefined error (VK).
+% /Frequency 150
+% /Angle 20
+ % the values for /Frequency, /Angle are irrelevant
+% /SpotFunction {pop}
+%>>
+%setscreen
+% 70 45 seem to replace /Frequency and /Angle in dict
+% - Note: NO curly braces around the dict!
+% Works on HP LJ4m, produces errors with HP LJ3Si,
+% Produces "linescreen" on HP LJ4mv caused by {pop} (VK).
+
+
+%<<
+% /HalftoneType 1
+% % 0 gives range check error, 2 gives undefined error (VK).
+% /Frequency 70
+% /Angle 45
+% /SpotFunction {pop}
+%>>
+%sethalftone % Level 2 only
+% Produces "linescreen" on HP LJ4mv caused by {pop} (VK).