Color Recognition in VB.net , Rgb

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Hi All,

Now I want to make color recognition for picture that stored in hard disk. I want to separate color (which pixel is blue, which pixel is red and so on). I used Visual Studio 2008 . Is it possible to develop it? Anyone make me suggestion , please.

Posted 2-Nov-10 22:48pm

dartfrog

Updated 28-Nov-11 21:54pm

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Rajesh Anuhya · Accepted Answer · 2010-11-02T22:55:00

go through the below code this may helps you

using System;
using System.Drawing;
using System.Windows.Forms;

namespace GetPixelExample
{
    public class Form1 : Form
    {
        private class ImageControl : Panel
        {
            private Bitmap bitmap = new Bitmap("C:\\alien.jpg");

            public ImageControl()
            {
                MouseMove += new MouseEventHandler(HandleMouseMove);
            }

            private void HandleMouseMove(object sender, MouseEventArgs e)
            {
                // Scale the window coordinates to the bitmap coordinates
                double windowX = e.X;
                double windowY = e.Y;

                double controlWidth = Width;
                double controlHeight = Height;
                double imageWidth = bitmap.Width;
                double imageHeight = bitmap.Height;

                Color pixel = bitmap.GetPixel(
                   (int)(windowX * bitmap.Width / controlWidth), 
                   (int)(windowY * bitmap.Height / controlHeight));
                System.Diagnostics.Debug.WriteLine(pixel);
            }

            protected override void OnResize(EventArgs eventargs)
            {
                base.OnResize(eventargs);
                Invalidate();
            }

            protected override void  OnPaintBackground(PaintEventArgs pevent)
            {
                 pevent.Graphics.DrawImage(bitmap, Bounds);
            }
        }

        public Form1()
        {
            ImageControl control = new ImageControl();
            control.Dock = DockStyle.Fill;
            Controls.Add(control);
            this.PerformLayout();
        }

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}

OriginalGriff · Accepted Answer · 2010-11-02T23:00:00

Yes, it it possible. But it may not be as simple as you think - it may depend on what the file is stored as. A bitmap is easy: a pixel is a pixel. A jpeg is not so easy: the data is compressed using a "lossy" algorithm, so what starts out as a red pixel next to a blue pixel may become a magenta pixel.

Either way, the first place to start is to load your image:

Image i = Image.FromFile(path);

Then look at each pixel individually:

int pixel = i.GetPixel(x, y);

The pixel then contains the ARGB value.

int Red = (pixel >> 16) & 0xFF;
int Green = (pixel >> 8) & 0xFF;
int Blue = pixel & 0xFF;

Color Recognition in VB.net , Rgb

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