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convert ( imgbase*.gif -colorspace Gray -colors 2 -negate ) -colorize 
+$color -negate -transparent white outimg%02d.gif
convert -background white outimg01.gif outimg02.gif outimg03.gif $etc 
+-flatten outcomp.gif

my $image;

...

$compos->Flatten();
$compos->Write('outcomp.gif');