C#彩色圖片灰度化算法

網上幾種算法中速度相對較快的

 
    Bitmap newBitmap = 
    Graphics g =
    System.Drawing.Imaging.ColorMatrix colorMatrix =   [] {.3f, .3f, .3f, ,  [] {.59f, .59f, .59f, ,  [] {.11f, .11f, .11f, ,  [] {, , , ,  [] {, , , , 
    System.Drawing.Imaging.ImageAttributes attributes = 

    g.DrawImage(original,  Rectangle(, , original.Width, original.Height), ,