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%!PS
%   Postscript that uses Ghostscript extensions to do simple transparency

/PageUsesTransparency true def

systemdict /.setalphaisshape known not
{
    (\n\n%%%% WARNING: Transparency operations ignored - probably due to using -dSAFER\n\n) print flush
    /.pushpdf14devicefilter {pop} bind def
    /.begintransparencygroup {pop pop pop pop pop} bind def
    /.endtransparencygroup {} bind def
    /.poppdf14devicefilter {} bind def
    /.setopacityalpha {pop} bind def
    /.setshapealpha {pop} bind def
    /PageUsesTransparency false def
} if


<<
   /PageUsesTransparency PageUsesTransparency	% needed if we are using transparency
   /CompatibilityLevel 1.4
   /PageSpotColors 0
>> setpagedevice % in case we are going to pdfwrite

% work around rectfill mapping directly to device fill_rectangle
/rectfill {
  gsave 4 2 roll moveto 1 index 0 rlineto
  0 exch rlineto neg 0 rlineto closepath fill grestore
} bind def

0 .pushpdf14devicefilter % depth .pushpdf14devicefilter -
.5 .9 .2 setrgbcolor
0 0 300 700 rectfill

.2 .5 .9 setrgbcolor
200 100 400 400 rectfill

     << >> clippath pathbbox newpath .begintransparencygroup

     .5 .setopacityalpha 1 .setshapealpha

     .9 .3 .1 setrgbcolor

     100 200 500 500 rectfill

     .endtransparencygroup
.poppdf14devicefilter
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