C#彩色图片灰度化算法实例

public static Bitmap MakeGrayscale(Bitmap original)

{

    //create a blank bitmap the same size as original

    Bitmap newBitmap = new Bitmap(original.Width, original.Height);

    //get a graphics object from the new image

    Graphics g = Graphics.FromImage(newBitmap);

    //create the grayscale ColorMatrix

    System.Drawing.Imaging.ColorMatrix colorMatrix = new System.Drawing.Imaging.ColorMatrix(

       new float[][]

      {

         new float[] {.3f, .3f, .3f, 0, 0},

         new float[] {.59f, .59f, .59f, 0, 0},

         new float[] {.11f, .11f, .11f, 0, 0},

         new float[] {0, 0, 0, 1, 0},

         new float[] {0, 0, 0, 0, 1}

      });

    //create some image attributes

    System.Drawing.Imaging.ImageAttributes attributes = new System.Drawing.Imaging.ImageAttributes();

    //set the color matrix attribute

    attributes.SetColorMatrix(colorMatrix);

    //draw the original image on the new image

    //using the grayscale color matrix

    g.DrawImage(original, new Rectangle(0, 0, original.Width, original.Height), 0, 0, original.Width, original.Height, GraphicsUnit.Pixel, attributes);

    //dispose the Graphics object

    g.Dispose();

    return newBitmap;

}