Hi,
The 'light' colors defined in colo-imp-rgb.mkiv are not light!
\definecolor [lightred] [r=1, g=0, b=0]
\definecolor [lightgreen] [r=0, g=1, b=0]
\definecolor [lightblue] [r=0, g=0, b=1]
\definecolor [lightcyan] [r=0, g=1, b=1]
\definecolor [lightmagenta] [r=1, g=0, b=1]
\definecolor [lightyellow] [r=1, g=1, b=0]
Is this intentional? How about replacing them with somewhat reasonable defaults?
\definecolor [lightred] [r=1, g=0.5, b=0.5]
\definecolor [lightgreen] [r=0.5, g=1, b=0.5]
\definecolor [lightblue] [r=0.75, g=1, b=1]
\definecolor [lightcyan] [r=0.5, g=1, b=1]
\definecolor [lightmagenta] [r=1, g=0.5, b=1]
\definecolor [lightyellow] [r=1, g=1, b=0.5]
See attached output. These are not the ideal choices in terms of shades, but I have chosen values which are least subjective and still give reasonable shades.
Aditya