BTW: this is my little transparency trick: in my fgfs.mp library file I have this:
color foreground, transparent;
background:=black;
transparent:=white;
white:=255/256white;
foreground:=white;
which lets white actually be written as 254/254/254 ... white enough (who needs true
white, anyway), and transparent areas are 255/255/255. Note that 1/2a is the same
as (1/2)a or .5a, and not 1/(2a).
***
now I can "draw foo withcolor transparent"
***
and later, in my Makefile I have lines like these:
foo.rgb: foo.mp Makefile
mpost foo.mp
convert -density 1024x1024 foo.1 -transparent white -resize 256x256
sgi:foo.rgb
m.
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