Hi Nigel,

how about:

\setupoutput[pdftex]
\setupcolors[state=start]

\startreusableMPgraphic{bg}
   StartPage ;
     z11 = ulcorner Page ;
     z12 = urcorner Page ;
     z13 = lrcorner Page ;
     z14 = llcorner Page ;
     z91 = (-1, 1.414) ;
     z92 = ( 1, 1.414) ;
     z93 = ( 1,-1.414) ;
     z94 = (-1,-1.414) ;
     z21 = z11 - 16z91 ;
     z22 = z12 - 16z92 ;
     z23 = z13 - 16z93 ;
     z24 = z14 - 16z94 ;
     z31 = z21 - 6z91 ;
     z32 = z22 - 6z92 ;
     z33 = z23 - 6z93 ;
     z34 = z24 - 6z94 ;
     fill z11--z12--z13--z14--z11--z21--z24--z23--z22--z21--cycle withcolor
yellow ;
     fill z21--z22--z32--z31--cycle withcolor .9white ;
     fill z22--z23--z33--z32--cycle withcolor .8white ;
     fill z23--z24--z34--z33--cycle withcolor .9white ;
     fill z24--z21--z31--z34--cycle withcolor .8white ;
   StopPage ;
\stopreusableMPgraphic

\startreusableMPgraphic{bg} StartPage ; fill Page enlarged 1mm withcolor yellow ; % bleed path p ; p := Page enlarged -5mm ; path q ; q := Page enlarged -10mm ; fill q withcolor white ; drawoptions(withcolor red) ; fill reverse topboundary q -- topboundary p -- cycle ; fill reverse bottomboundary q -- bottomboundary p -- cycle ; drawoptions(withcolor green) ; fill reverse leftboundary q -- leftboundary p -- cycle ; fill reverse rightboundary q -- rightboundary p -- cycle ; StopPage ; \stopreusableMPgraphic

\defineoverlay
    [bg]
    [\reuseMPgraphic{bg}]

\setupbackgrounds
    [page]
    [background={bg}]

\starttext
\dorecurse{3}{\input knuth}
\stoptext

Hans ------------------------------------------------------------------------- Hans Hagen | PRAGMA ADE | [EMAIL PROTECTED] Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: +31 (0)38 477 53 69 | fax: +31 (0)38 477 53 74 | www.pragma-ade.com ------------------------------------------------------------------------- information: http://www.pragma-ade.com/roadmap.pdf documentation: http://www.pragma-ade.com/showcase.pdf -------------------------------------------------------------------------

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