display average pixel values

This is a discussion on display average pixel values within the C# Programming forums, part of the General Programming Boards category; Hi. I have a project which opens an image in PictureBox1, no problem. But the Public Static Color method at ...

  1. #1
    Registered User
    Join Date
    Nov 2010
    Reading, England, United Kingdom

    display average pixel values

    I have a project which opens an image in PictureBox1, no problem. But the Public Static Color method at the bottom of the code is not working. I was hoping it would display the average value of the pixels in the image. Can anybody help me to understand why it is not working please? Thank you.

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing.Imaging;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;
    namespace imageAlign
        public partial class Form1 : Form
            public Form1()
            private void button1_Click(object sender, EventArgs e)
                Bitmap myImage1 = (Bitmap)pictureBox1.Image;
                OpenFileDialog ofd1 = new OpenFileDialog();
                if (ofd1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                    pictureBox1.Image = Image.FromFile(ofd1.FileName);
                    Image k = Image.FromFile(ofd1.FileName);
                    Graphics g = Graphics.FromImage(k);
                    g.FillRectangle(Brushes.White, 155, 235, 120, 70);
                    g.DrawRectangle(Pens.YellowGreen, 155, 235, 120, 70);
                    StringFormat sf = (StringFormat)StringFormat.GenericTypographic.Clone();
                    sf.Alignment = StringAlignment.Center;
                    sf.LineAlignment = StringAlignment.Center;
                    g.DrawString(DateTime.Now.ToShortDateString(), new
                    Font("Arial", 14, GraphicsUnit.Point), Brushes.Black, new RectangleF(157, 237, 114, 65), sf);
                    k.Save("C:\\testimage.jpeg", ImageFormat.Jpeg);
                    Image image_rect = Image.FromFile("C:\\testimage.jpeg");
                    pictureBox3.Image = image_rect;
                    //pictureBox3.Height = image_rect.Height;
                    //pictureBox3.Width = image_rect.Width;
                 public static Color getDominantColor(Bitmap myImage1)
                      //Used for tally
                int i = 0;
                int j = 0;
                int r = 0;
                int g = 0;
                int b = 0;
                int total = 0;
                for (i = 0; i < myImage1.Width; i++)
                    for (j = 0; j < myImage1.Height; j++)
                        Color clr = myImage1.GetPixel(i, j);
                        r += clr.R;
                        g += clr.G;
                        b += clr.B;
                //Calculate average
                r /= total;
                g /= total;
                b /= total;
                Console.WriteLine(j.ToString() + " " + i.ToString());
                return Color.FromArgb(r, g, b);
            private void button2_Click(object sender, EventArgs e)
                Bitmap myImage2 = (Bitmap)pictureBox2.Image;
                OpenFileDialog ofd2 = new OpenFileDialog();
                if (ofd2.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                    pictureBox2.Image = Image.FromFile(ofd2.FileName);

  2. #2
    (?<!re)tired Mario F.'s Avatar
    Join Date
    May 2006
    What's not working exactly? I can't seem to be able to tell from looking at it.

    Meanwhile, you don't need the total variable. "total" is equal to myImage1.Width * myImage1.Height. No need to be incrementing this variable in the loop. Your code will also be clear if you replace j.ToString() and i.ToString() with myImage1.Height and myImage1.Width, respectively.
    The programmer’s wife tells him: “Run to the store and pick up a loaf of bread. If they have eggs, get a dozen.”
    The programmer comes home with 12 loaves of bread.

    Originally Posted by brewbuck:
    Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.

  3. #3
    Cat is offline
    Registered User
    Join Date
    May 2003
    Only immediate problem I could see would be if you had integer overflow - but that would require a fairly large image (2900x2900 or larger, depending on the color).

    Agree that something more than "doesn't work" is needed to troubleshoot further.
    You ever try a pink golf ball, Wally? Why, the wind shear on a pink ball alone can take the head clean off a 90 pound midget at 300 yards.

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