using System;

using System.Collections.Generic;

using System.Drawing;

using System.Drawing.Imaging;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace bitmapdemo

{

    class Program

    {

        static void Main(string[] args)

        {

            //设定新图的高度长度参数

            var width = ;

            var height = ;

            //剪切大小

            int cutwidth=;

            int cutheight=;

            Graphics g;

            Bitmap bm = new Bitmap(@"D:\ip.jpg");

            Bitmap bm3 = new Bitmap(@"D:\1.jpg");

            Bitmap bm2 = new Bitmap(bm3, width, height);  //将原图缩小

            Rectangle rg = new Rectangle(, , cutwidth, cutheight);

            g = Graphics.FromImage(bm2);// bm2上画bm

            g.DrawImage(bm, rg);// 剪裁bm

            bm2.Save("d:/1c.gif", ImageFormat.Gif);//更改原图的格式类型再保存

            //bm2.Save("d:/1c1.jpg", ImageFormat.Jpeg);//更改的原图的大小再保存

        }

    }

}