frmPicAdjust.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Imaging;
namespace PictureManage
{
    public partial class frmPicAdjust : Form
    {
        public frmPicAdjust()
        {
            InitializeComponent();
        }
        public Image ig;
        public string PicOldPath;
        private void frmPicAdjust_Load(object sender, EventArgs e)
        {
            ptbOlePic.Image = ig;
            ptbNewPic.Image = ig;
        }

        public static Bitmap KiLighten(Bitmap b, int degree)//亮度调节
        {
            if (b == null)
            {
                return null;
            }
            //确定最小值和最大值
            if (degree < -255) degree = -255;
            if (degree > 255) degree = 255;
            try
            {
                //确定图像的宽和高
                int width = b.Width;
                int height = b.Height;

                int pix = 0;
                //LockBits将Bitmap锁定到内存中
                BitmapData data = b.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
                unsafe
                {
                    //p指向地址
                    byte* p = (byte*)data.Scan0;//8位无符号整数
                    int offset = data.Stride - width * 3;
                    for (int y = 0; y < height; y++)
                    {
                        for (int x = 0; x < width; x++)
                        {
                            // 处理指定位置像素的亮度
                            for (int i = 0; i < 3; i++)
                            {
                                pix = p[i] + degree;
                                if (degree < 0) p[i] = (byte)Math.Max(0, pix);
                                if (degree > 0) p[i] = (byte)Math.Min(255, pix);
                            } // i
                            p += 3;