BitmapData处理图像例子【逆反处理】

原文发布时间为：2009-01-16 —— 来源于本人的百度文章 [由搬家工具导入]

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

using System.Drawing.Imaging;
namespace neicun
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Bitmap m_Bmp = new Bitmap("d:\\nvhai.bmp");//锁定位图像素
            int h = m_Bmp.Height;
            int w = m_Bmp.Width;

            Bitmap bmpOut = new Bitmap(w, h, PixelFormat.Format24bppRgb);

            BitmapData dataIn = m_Bmp.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
            BitmapData dataOut = bmpOut.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

            unsafe
            {
                byte* pIn = (byte*)(dataIn.Scan0.ToPointer());
                byte* pOut = (byte*)(dataOut.Scan0.ToPointer());

                for (int y = 0; y < dataIn.Height; y++)
                {
                    for (int x = 0; x < dataIn.Width; x++)
                    {

                        pOut[0] = (byte)(255 - pIn[0]);
                        pOut[1] = (byte)(255 - pIn[1]);
                        pOut[2] = (byte)(255 - pIn[2]);

                        pIn += 3;
                        pOut += 3;
                    }

                    pIn += dataIn.Stride - dataIn.Width * 3;
                    pOut += dataOut.Stride - dataOut.Width * 3;
                }
            }

            bmpOut.UnlockBits(dataOut);
            m_Bmp.UnlockBits(dataIn);
            pictureBox1.Image = bmpOut;
        }
    }
}