C# 获取图片某像素点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...");
    }
}