public class Grisaille extend Color{
    public Color c;
    Grisaille(float c){
	if (c < 0){
	    this.c = Color(0,0,0);
	}
	if (c > 1){
	    this.c = Color(1,1,1);
	}
	if (c >= 0 && c <= 1){
	    this.c = Color(c,c,c);
	}
    }
}
