public override bool Equals(object obj)
{
if (!(obj is CmykColor))
{
return(false);
}
CmykColor c2 = (CmykColor)obj;
return(Cyan.ApproxEquals(c2.Cyan) && Magenta.ApproxEquals(c2.Magenta) && Yellow.ApproxEquals(c2.Yellow) && Black.ApproxEquals(c2.Black));
}