如何获取图象中某点的像素值，如想得到一张600*800的图片中（200，300）这点的像素值，应该怎么做？

我自己顶一下！

就没人会？~天呐~

沒看懂题,说错了,不好意思
  你可以用API函數做..這是我剛做的一個,你看看.CODE如下:
   [DllImport("user32.dll")]
        static extern IntPtr GetDC(IntPtr hwnd);

        [DllImport("user32.dll")]
        static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

        [DllImport("gdi32.dll")]
        static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);

        static public System.Drawing.Color GetPixelColor(int x, int y)
        {
            IntPtr hdc = GetDC(IntPtr.Zero);
            uint pixel = GetPixel(hdc, x, y);
            ReleaseDC(IntPtr.Zero, hdc);
            Color color = Color.FromArgb((int)(pixel & 0x000000FF),
            (int)(pixel & 0x0000FF00) >> 8,
            (int)(pixel & 0x00FF0000) >> 16);
            return color;
        }
        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            textBox1.Text = e.X.ToString();//坐標x值
            textBox2.Text = e.Y.ToString();//坐標y值
            richTextBox1.Text=GetPixelColor(e.X, e.Y).ToString();
            textBox3.Text = checkcolor(richTextBox1.Text.Trim(),"R=");//R值
            textBox4.Text = checkcolor(richTextBox1.Text.Trim(), "G=");//G值
            textBox5.Text = checkcolor(richTextBox1.Text.Trim(), "B=");//B值
            richTextBox1.Text = "該點的像數值是: R=" + textBox3.Text.Trim() + " G=" + textBox4.Text.Trim() + " B=" + textBox5.Text.Trim();
        }

        private string checkcolor(string temp,string filed)
        {
            string b = string.Empty;
            if (filed == "R=")
            {
                 b = temp.Trim().Substring(temp.Trim().IndexOf(filed) + filed.Length, temp.Trim().IndexOf("G=") - (temp.Trim().IndexOf(filed) + filed.Length+2));
            }
            if (filed == "G=")
            {
                 b = temp.Trim().Substring(temp.Trim().IndexOf(filed) + filed.Length, temp.Trim().IndexOf("B=") - (temp.Trim().IndexOf(filed) + filed.Length+2));
            }
            if (filed == "B=")
            {
                b = temp.Substring(temp.IndexOf(filed) + filed.Length, temp.Length - (temp.IndexOf(filed) + filed.Length+1));
            }
           
            return b;
        }

[[it] 本帖最后由 wzg0319 于 2008-8-18 10:51 编辑 [/it]]

这里有个帖子，和你问的问题是一样的，你可以看下，我是看不懂
http://www.

Color pixelColor = image1.GetPixel(x, y);
                Color newColor = Color.FromArgb(pixelColor.R, 0, 0);
                image1.SetPixel(x, y, newColor);