Um, 

http://www.fltk.org/documentation.php/doc-1.1/Fl.html#Fl.get_color

void Fl::get_color(Fl_Color c, uchar&r, uchar&g, uchar&b);
and 
unsigned Fl::get_color(Fl_Color c);

convert from any color value in FLTK to RGB components.


see also:
http://www.fltk.org/documentation.php/doc-1.1/Fl.html#Fl.set_color


fl_rgb_color converts the other way around:

http://www.fltk.org/documentation.php/doc-1.1/functions.html#fl_rgb_color

 - Matthias

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