using System;using System.Drawing;using System.Drawing.Imaging;using System.Runtime.InteropServices;namespace ConsoleApplication1{    class ImageUtil    {        public static void  ClearBlank(string sourceFileName,out int x,out int y,out int w,out int h)         {
                using (var image = new Bitmap(sourceFileName))             {
                    //获取图像的BitmapData对像                 var data = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);                 //循环处理                 var minW = 1000000;                 var maxW = 0;                 var minH = 1000000;                 var maxH = 0;                 unsafe                 {
                        byte* ptr = (byte*)(data.Scan0.ToPointer());                     for (var i = 0; i < data.Height; i++)                     {
                            for (var j = 0; j < data.Width; j++)                         {
                                var a = Convert.ToInt32(ptr[0].ToString());                             var b = Convert.ToInt32(ptr[1].ToString());                             var c = Convert.ToInt32(ptr[2].ToString());                             if (a < 150 && b < 150 && c < 150)                             {
                                    if ((j + 1) > maxW)                                 {
                                        maxW = j + 1;                                 }                                 if ((i + 1) > maxH)                                 {
                                        maxH = i + 1;                                 }                                 if ((j + 1) < minW)                                 {
                                        minW = j + 1;                                 }                                 if ((i + 1) < minH)                                 {
                                        minH = i + 1;                                 }                             }                             ptr += 3;                         }                         ptr += data.Stride - data.Width * 3;                     }                 }                 x = minW;                 y = minH;                 w = maxW - minW;                 h = maxH - minH;             }         }    }}