File:     @(#)$Id: README,v 2.6 2000/11/09 18:33:58 Martin Beta $
  Contents: README file for the pcl3 distribution
  Author:   Martin Lottermoser, Greifswaldstrasse 28, 38124 Braunschweig,
            Germany. E-mail: Martin.Lottermoser@t-online.de.
[...]
 8. There is also a bug in ghostscript's default configuration for the
    undercolour removal and black generation functions. It shows up when
    printing PostScript documents using the RGB colour space ("setrgbcolor" or
    "sethsbcolor") on a device where the CMYK space is the native colour space;
    this is the case for pcl3 if you specify "-sColourModel=CMYK". The bug
    results in black being printed as a mixture of cyan, magenta, and yellow.
    On my printer, this is a slightly greenish grey with fuzzy edges. My
    subjective impression is that correcting this bug leads to sharper-looking
    images.
[...]

I generated a patch as suggested from Martin Lottermoser

	-andreas

--- lib/gs_init.ps.orig	Mon Jan  8 20:47:39 2001
+++ lib/gs_init.ps	Mon Jan  8 20:49:02 2001
@@ -1229,7 +1229,7 @@
 % Set the default screen and BG/UCR.
 /.setdefaultbgucr {
   systemdict /setblackgeneration known {
-    { pop 0 } dup setblackgeneration setundercolorremoval
+    {} dup setblackgeneration setundercolorremoval
   } if
 } bind def
 /.useloresscreen {	% - .useloresscreen <bool>