c#利用Grahics进行图片裁剪

/// <summary>
        /// 裁剪图片
        /// </summary>
        /// <param name="imagePath"/>
        /// <param name="savePath">"c:images"</param>
        private List<string> DefClipImage(string imagePath,string savePath)
        {

            var fileInfo = new FileInfo(imagePath);
            if (!fileInfo.Exists)
                throw new Exception("图片" + imagePath + "不存在！");
            var savePathList = new List<string>();
            var spath = savePath + fileInfo.Name.Replace(fileInfo.Extension,string.Empty);
            try
            {
                var bitmap = new Bitmap(imagePath);
                var format = bitmap.PixelFormat;
                Bitmap cloneBitmap = bitmap.Clone(_cloneRect1,format);
                var tempPath = spath + "_1.jpg";
                cloneBitmap.Save(tempPath);
                savePathList.Add(tempPath);
                cloneBitmap.Dispose();
                cloneBitmap = bitmap.Clone(_cloneRect2,format);
                tempPath = spath + "_2.jpg";
                cloneBitmap.Save(tempPath);
                savePathList.Add(tempPath);
                cloneBitmap.Dispose();
                cloneBitmap = bitmap.Clone(_cloneRect3,format);
                tempPath = spath + "_3.jpg";
                cloneBitmap.Save(tempPath);
                savePathList.Add(tempPath);
                cloneBitmap.Dispose();
                cloneBitmap = bitmap.Clone(_cloneRect4,format);
                tempPath = spath + "_4.jpg";
                cloneBitmap.Save(tempPath);
                savePathList.Add(tempPath);
                cloneBitmap.Dispose();
                bitmap.Dispose();
                return savePathList;

            }
            catch
            {
                throw new Exception("图片" + imagePath + "处理失败！");

            }

        }

   private void test()
        {

            Bitmap bitmap = new Bitmap(Application.StartupPath + @"Image1.jpg");
            var bt = new Bitmap(7500,3750);

            var grahics = Graphics.FromImage(bt);
            grahics.DrawImage(bitmap,_cloneRect1,GraphicsUnit.Pixel);
            bt.Save(Application.StartupPath + "1.jpg");

            grahics.DrawImage(bitmap,_cloneRect2,GraphicsUnit.Pixel);
            bt.Save(Application.StartupPath + "2.jpg");

            grahics.DrawImage(bitmap,_cloneRect3,GraphicsUnit.Pixel);
            bt.Save(Application.StartupPath + "3.jpg");

            grahics.DrawImage(bitmap,_cloneRect4,GraphicsUnit.Pixel);
            bt.Save(Application.StartupPath + "4.jpg");

            grahics.Dispose();
            bt.Dispose();
        }