代码如下所示：

复制代码 代码如下:

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;

}