[NTG-context] Missing graphic in MPpage when viewing in Apple MAC Preview or GIMP 2.10 but not Adobe

[Keith McKay]

Dear List

I have come across a problem which I don't think is due to ConTeXt but 
I'm hopping the great and the good of this list may be able to explain 
what is going on.

The code below produces an MPpage with a shaded background and two 
graphics along with a line of outlined text. When I view in Adobe (or 
the output from TeXworks) I see everything as it should be. However, I 
wanted to convert the MPpage to a jpeg file and when I opened the pdf in 
either Apple MAC Preview or Gimp 2.10 the two graphics are missing, and 
I have no idea why.

Could someone explain a way round this?  Here is the code.

Thanks

Keith

%%%%%%%%%%%%%%%%%%%%%%%%%% system >

system > ConTeXt ver: 2020.07.29 18:36 LMTX fmt: 2020.7.29 int: 
english/english

system >

%%%%%%%%%%%%%%%%%%%%%%%%%%%

\setuppapersize [A5, portrait]

\usecolors[crayola]

\starttext

\startMPpage

StartPage;

width := PaperWidth ; height := PaperHeight ; unit := cm ;

definecolor [ name = "MyColor1", r = 0.781, g = 0.5, b = 0.5 ] ;

definecolor [ name = "MyColor3", r = 1, g = 1, b = 0.7983 ] ;

draw lmt_shade [

path = unitsquare xscaled 14.8cm yscaled 21cm,

direction = "up",

alternative = "linear",

colors = { "MyColor1", "MyColor3" },

] ;

z0 = (60,60);

z1 = z0 rotated 120;

z2 = z1 rotated 240;

path carre;

carre = z0--z1--z2--cycle;

picture pic;

pic := image(

numeric d; d := 0.0005;

for i=1 step -d until d:

fill carre scaled i shifted (3.9cm,17cm) withcolor((1 + 
i)*(\MPcolor{VividTangerine})) ;

fill carre rotated (45) scaled i shifted (3.9cm,17cm) withcolor((1 + 
i)*(\MPcolor{VividTangerine})) ;

fill carre rotated (90) scaled i shifted (3.9cm,17cm) withcolor((1 + 
i)*(\MPcolor{VividTangerine})) ;

fill carre rotated (135) scaled i shifted (3.9cm,17cm) withcolor((1 + 
i)*(\MPcolor{VividTangerine})) ;

fill carre rotated (180) scaled i shifted (3.9cm,17cm) withcolor((1 + 
i)*(\MPcolor{VividTangerine})) ;

fill carre rotated (225) scaled i shifted (3.9cm,17cm) withcolor((1 + 
i)*(\MPcolor{VividTangerine})) ;

endfor;);

draw pic rotatedaround(center pic, 270);

draw pic rotatedaround(center pic, 90) shifted (7cm,-13cm) ;

draw lmt_outline [

text = "Page 18"

kind = "draw",

drawcolor = "VividTangerine",

] xsized TextWidth shifted (1cm,7.67cm);

StopPage;

\stopMPpage

\stoptext

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