获取图片的主色调

Color get_major_color(Bitmap bitmap)

{

    //色调的总和

    var
sum_hue = 0d;

    //色差的阈值

    var
threshold = 30;

    //计算色调总和

    for
(int
h = 0; h < bitmap.Height; h++)

    {

        for
(int
w = 0; w < bitmap.Width; w++)

        {

            var
hue = bitmap.GetPixel(w, h).GetHue();

            sum_hue += hue;

        }

    }

    var
avg_hue = sum_hue / (bitmap.Width * bitmap.Height);

    //色差大于阈值的颜色值

    var
rgbs = new
List<Color>();

    for
(int
h = 0; h < bitmap.Height; h++)

    {

        for
(int
w = 0; w < bitmap.Width; w++)

        {

            var
color = bitmap.GetPixel(w, h);

            var
hue = color.GetHue();

            //如果色差大于阈值，则加入列表

            if
(Math.Abs(hue - avg_hue) > threshold)

            {

                rgbs.Add(color);

            }

        }

    }

    if
(rgbs.Count == 0)

        return
Color.Black;

    //计算列表中的颜色均值，结果即为该图片的主色调

    int
sum_r = 0, sum_g = 0, sum_b = 0;

    foreach
(var
rgb in
rgbs)

    {

        sum_r += rgb.R;

        sum_g += rgb.G;

        sum_b += rgb.B;

    }

    return
Color.FromArgb(sum_r / rgbs.Count,

        sum_g / rgbs.Count,

        sum_b / rgbs.Count);

}