解析C#彩色图像灰度化算法的实现代码详解

代码如下所示：

        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;
        }