C# 擷取圖片某像素點RGB565值

Project Source Download: http://download.csdn.net/detail/mostone/6360007

    public partial class FormMain : Form    {        Bitmap bmpZoom = null;        Bitmap bmpSrc = null;        public FormMain()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            try            {                DialogResult isDone = openFileDialog1.ShowDialog();                if (isDone == DialogResult.OK)                {                    pictureBox1.Image = null;                    pictureBox2.Image = null;                    bmpSrc = null;                    bmpZoom = null;                    Image img = Bitmap.FromFile(openFileDialog1.FileName);                    pictureBox1.Image = img;                    bmpSrc = new Bitmap(img);                }            }            catch (Exception ex)            {                pictureBox1.Image = null;                bmpSrc = null;                MessageBox.Show(ex.Message);            }        }        private void pictureBox1_MouseClick(object sender, MouseEventArgs e)        {            const int zoomSize = 8;            if (this.bmpSrc == null)            {                return;            }            bmpZoom = null;            bmpZoom = new Bitmap(pictureBox2.Width, pictureBox2.Height);            Graphics grpDst = Graphics.FromImage(bmpZoom);            // zoom to 8x            int width = pictureBox2.Width / zoomSize;            int height = pictureBox2.Height / zoomSize;            int offsetX = width / 2;            int offsetY = height / 2;            int x = e.X - offsetX;            int y = e.Y - offsetY;            if (offsetX + e.X >= bmpSrc.Width)            {                x = bmpSrc.Width - offsetX * 2;            }            else if (x < 0)            {                x = 0;            }            if (offsetY + e.Y >= bmpSrc.Height)            {                y = bmpSrc.Height - offsetY * 2;            }            else if (y < 0)            {                 y = 0;            }            Color color;            int oriX = x;            for (int row = 0; row < pictureBox2.Height; row += zoomSize)            {                if (y >= bmpSrc.Height) break;                for (int col = 0; col < pictureBox2.Width; col += zoomSize)                {                    if (x >= bmpSrc.Width) break;                    // get pixel color                    color = bmpSrc.GetPixel(x, y);                    // draw zoom block                    grpDst.FillRectangle(new SolidBrush(color), col, row, zoomSize, zoomSize);                    x++;                }                x = oriX;                y++;            }            pictureBox2.Image = bmpZoom;        }        private void pictureBox2_MouseClick(object sender, MouseEventArgs e)        {            if (bmpZoom == null) return;            Color color = bmpZoom.GetPixel(e.X, e.Y);            labelColor.BackColor = color;            String val = color.ToArgb().ToString("X");            textBox1.Text = "#" + val.Substring(2);            textBox2.Text = "#" + rgb565FromColor(color).ToString("X");            textBox3.Text = "#" + rgb565PFromColor(color).ToString("X");        }        private int rgb565FromColor(Color color)        {            int val = color.B >> 3 << 11;            val |= color.G >> 2 << 5;            val |= color.R >> 3;            return val;        }        private int rgb565PFromColor(Color color)        {            int val = color.R >> 3 << 11;            val |= color.G >> 2 << 5;            val |= color.B >> 3;            return val;        }        private void button2_Click(object sender, EventArgs e)        {            MessageBox.Show(@"Image Color Picker    by mostone@hotmail.com    http://blog.csdn.net/mostone    2013-10-06", "About...");        }    }}