c#图像处理bmp转化为灰度图片

c#图像处理（bmp转化为灰度图片），详细，简单，文件包有创建说明，相当详细。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;


namespace readbmp2
{
    public partial class Form1 : Form
    {

        void GrayMenuClick（）
        {
            Bitmap bmp = new Bitmap（picBox.Image）;
            Bitmap newbmp = new Bitmap（picBox.Image）;
            Color c = new Color（）;
            Color NewC;
            Byte r g b gray;

            for （int i = 0; i < bmp.Width; i++）
            {
                for （int j = 0; j < bmp.Height; j++）
                {
                    c = bmp.GetPixel（i j）;
                    r = c.R;
                    g = c.G;
                    b = c.B;
                    gray = （Byte）（（r * 19595 + g * 38469 + b * 7472） >> 16）;
                    NewC = Color.FromArgb（gray gray gray）;
                    newbmp.SetPixel（i j NewC）;
                }
            }

            // 刷新显示
            picBox.Refresh（）;
            picBox.Image = newbmp;
        }
        void SaveMenuClick（）
     {
          string filename;
         SaveFileDialog dlg=new SaveFileDialog（）;
          dlg.Filter=“JPG File（*.jpg）|*.jpg|Bmp File（*.bmp）|*.bmp|All Files（*.*）|*.*“;
          if （dlg.ShowDialog（）== DialogResult.OK） {
              filename=dlg.FileName;
             if （picBox.Image!=null） {
                 picBox.Image.Save（filename）;
             }
             else
             {
                MessageBox.Show（“没有图像可以保存！“）;
             }
         }
     }


        public Form1（）
        {
            InitializeComponent（）;
        }

        private void Form1_Load（object sender EventArgs e）
        {

            picBox.Location = new Point（30 30）;
            picBox.Size = new Size（400 300）;
            btnOpen.Location = new Point（30 350）;
            button2.Location = new Point（180 350）;
            button3.Location = new Point（310 350）;
            
        }

        private void btnOpen_Click（object sender EventArgs e）
        {
            OpenFileDialog ofdPic = new OpenFileDialog（）;
            ofdPic.Filter = “JPG（*.JPG;*.JPEG）;gif文件（*.GIF）|*.jpg;*.jpeg;*.gif“;
            ofdPic.FilterIndex = 1;
            ofdPic.RestoreDirectory = true;
            ofdPic.FileName = ““;
            if （ofdPic.ShowDialog（） == DialogResult.OK）
            {
                string sPicPaht = ofdPic.FileName.ToString（）;
                FileInfo fiPicInfo = new FileInfo（sPicPaht）;
                long lPicLong = fiPicInfo.Length / 1024;
                string sPicName = fiPicInfo.Name;
                string sPicDirectory = fiPicInfo.Directory.ToString（）;
                string sPicDirectoryPath = fiPicInfo.DirectoryName;
                Bitmap bmPic = new Bitmap（sPicPaht）;
                //if （lPicLong > 400）
                //{
                // 

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2012-06-11 10:49  readbmp2\
     目录           0  2012-06-11 10:48  readbmp2\readbmp2\
     文件         866  2012-06-10 11:21  readbmp2\readbmp2.sln
     文件       18944  2012-06-11 10:39  readbmp2\readbmp2.suo
     目录           0  2012-06-11 10:48  readbmp2\readbmp2\bin\
     目录           0  2012-06-11 10:48  readbmp2\readbmp2\bin\Debug\
     文件       10752  2012-06-11 10:46  readbmp2\readbmp2\bin\Debug\readbmp2.exe
     文件       26112  2012-06-11 10:46  readbmp2\readbmp2\bin\Debug\readbmp2.pdb
     文件       11600  2012-06-11 10:46  readbmp2\readbmp2\bin\Debug\readbmp2.vshost.exe
     文件         490  2010-03-17 22:39  readbmp2\readbmp2\bin\Debug\readbmp2.vshost.exe.manifest
     文件        4094  2012-06-11 10:46  readbmp2\readbmp2\Form1.cs
     文件        4375  2012-06-11 10:43  readbmp2\readbmp2\Form1.Designer.cs
     文件        5817  2012-06-11 10:43  readbmp2\readbmp2\Form1.resx
     目录           0  2012-06-11 10:48  readbmp2\readbmp2\obj\
     目录           0  2012-06-11 10:48  readbmp2\readbmp2\obj\x86\
     目录           0  2012-06-11 10:48  readbmp2\readbmp2\obj\x86\Debug\
     文件        4501  2012-06-10 18:10  readbmp2\readbmp2\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        6362  2012-06-11 10:46  readbmp2\readbmp2\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件         228  2012-06-11 10:43  readbmp2\readbmp2\obj\x86\Debug\GenerateResource.read.1.tlog
     文件         558  2012-06-11 10:43  readbmp2\readbmp2\obj\x86\Debug\GenerateResource.write.1.tlog
     文件         892  2012-06-11 10:46  readbmp2\readbmp2\obj\x86\Debug\readbmp2.csproj.FileListAbsolute.txt
     文件       10752  2012-06-11 10:46  readbmp2\readbmp2\obj\x86\Debug\readbmp2.exe
     文件         180  2012-06-11 10:43  readbmp2\readbmp2\obj\x86\Debug\readbmp2.Form1.resources
     文件       26112  2012-06-11 10:46  readbmp2\readbmp2\obj\x86\Debug\readbmp2.pdb
     文件         180  2012-06-10 18:32  readbmp2\readbmp2\obj\x86\Debug\readbmp2.Properties.Resources.resources
     文件        8031  2012-06-10 18:32  readbmp2\readbmp2\obj\x86\Debug\ResolveAssemblyReference.cache
     目录           0  2012-06-10 11:20  readbmp2\readbmp2\obj\x86\Debug\TempPE\
     文件         489  2012-06-10 11:20  readbmp2\readbmp2\Program.cs
     目录           0  2012-06-11 10:48  readbmp2\readbmp2\Properties\
     文件        1366  2012-06-10 11:20  readbmp2\readbmp2\Properties\AssemblyInfo.cs
     文件        2866  2012-06-10 11:20  readbmp2\readbmp2\Properties\Resources.Designer.cs
............此处省略5个文件信息