c# 剪裁图片

剪裁图片

/// 

        /// 剪裁图片
        /// 
        /// 原图片
        /// 左坐标
        /// 顶部坐标
        /// 右坐标
        /// 底部坐标
        /// 剪裁后的图片
        public static Image CutImage(Image src, int left, int top, int right, int bottom)
        {
            Bitmap srcBitmap = new Bitmap(src);
            int width = right - left;
            int height = bottom - top;
            Bitmap destBitmap = new Bitmap(width, height);
            using (Graphics g = Graphics.FromImage(destBitmap))
            {
                g.Clear(Color.Transparent);

                //设置画布的描绘质量         
                g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                g.DrawImage(srcBitmap, new Rectangle(0, 0, width, height), left, top, width, height, GraphicsUnit.Pixel);
            }

            return destBitmap;
        }

根据图片路径读取图片

  /// 

        /// 根据图片路径读取图片
        /// 
        /// 
        /// 
        public static Image ReadFromFile(string imageUrl)
        {
            Image img = null;
            FileStream fs = null;
            try
            {
                fs = new FileStream(imageUrl, FileMode.Open, FileAccess.Read);
                img = Image.FromStream(fs);
            }
            finally
            {
                fs.Close();
            }
            return img;
        }