c# finding similar colors

Question

I want to call a method with argument color. But there are a lot of colors which differ only by a shade. How can I find the colors which differ from my color only by little,

Answer 1

I found this routine here:

Color nearest_color = Color.Empty;
foreach (object o in WebColors)
{
    // compute the Euclidean distance between the two colors
    // note, that the alpha-component is not used in this example
    dbl_test_red = Math.Pow(Convert.ToDouble(((Color)o).R) - dbl_input_red, 2.0);
    dbl_test_green = Math.Pow(Convert.ToDouble
        (((Color)o).G) - dbl_input_green, 2.0);
    dbl_test_blue = Math.Pow(Convert.ToDouble
        (((Color)o).B) - dbl_input_blue, 2.0);

    temp = Math.Sqrt(dbl_test_blue + dbl_test_green + dbl_test_red);
    // explore the result and store the nearest color
    if(temp == 0.0)
    {
        nearest_color = (Color)o;
        break;
    }
    else if (temp < distance)
    {
        distance = temp;
        nearest_color = (Color)o;
    }
}