public ColorRGBA gradient(ColorRGBA c_8, double k)
{
ColorRGBAf c = c_8.GetAsRGBA_Floats();
ColorRGBAf ret;
ret.red = (float)(red + (c.red - red) * k);
ret.green = (float)(green + (c.green - green) * k);
ret.blue = (float)(blue + (c.blue - blue) * k);
ret.alpha = (float)(alpha + (c.alpha - alpha) * k);
return(ret.ToColorRGBA());
}