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%% turn examples to gray (see runmp for use)
%
  \special{ps:
    /setcmykcolor { exch 0.11 mul add
                    exch 0.59 mul add
                    exch 0.3 mul add
                    dup 1 gt { pop 1 }  if neg 1 add setgray } def
    /setrgbcolor { 0.11 mul
                   exch 0.59 mul add
                   exch 0.3 mul add setgray } def
    /sethsbcolor { /b exch def /s exch def 6 mul dup cvi dup /i exch def
sub /f exch def
                   /F [[0 1 f sub 1][f 0 1][1 0 1 f sub][1 f 0][1 f sub
1 0][0 1 f][0 1 1]] def
                   F i get { s mul neg 1 add b mul} forall
                   0.11 mul
                   exch 0.59 mul add
                   exch 0.3 mul add setgray } def
  }

\endinput