How Can I Show Pixel Value In A Bitmap Image

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Hello .. i'm beginner in C# and i just want to ask about to show the pixel value for each pixel in a bitmap picture

I've used the code below to open a bitmap picture:

C#

private void pictureBox1_Click(object sender, EventArgs e)
{
    OpenFileDialog dlg = new OpenFileDialog();
    dlg.Title = "Open Image";
    dlg.Filter = "bmp files (*.bmp)|*.bmp";
    if (dlg.ShowDialog() == DialogResult.OK)
    {
        pictureBox1.Image = Image.FromFile(dlg.FileName);
    }
    dlg.Dispose();

}

How can i modify it to show the pixel value in a label ?

Posted 16-Oct-14 23:48pm

Ali Gad

Updated 16-Oct-14 23:54pm

Leo Chapiro

v2

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Comments

Leo Chapiro 17-Oct-14 5:56am

Not clear what you want to achieve. What do you mean by "pixel value"?

Ali Gad 17-Oct-14 6:51am

Each of the pixels that represents an image stored inside a computer has a pixel value which describes how bright that pixel is .. i want to show this value

Ali Gad 17-Oct-14 6:51am

i want a label that shows value of each pixel when i move with the mouse in the picture

BillWoodruff 17-Oct-14 13:27pm

Do you know how to detect the mouse moving over the PictureBox ?

Ali Gad 17-Oct-14 14:23pm

no

[no name] 17-Oct-14 15:32pm

yes, replied wrong ;)

2 solutions

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George Jonsson · Answer 1 · 2014-10-16T23:58:00

Solution 1

Not sure what you mean by showing the pixel value, but to get the pixel value for a given coordinate you can use Bitmap.GetPixel[^]

Posted 16-Oct-14 23:58pm

George Jonsson

Comments

Ali Gad 17-Oct-14 6:43am

i want a label that shows value of each pixel when i move with the mouse in the picture

BillWoodruff 17-Oct-14 13:27pm

So, study the article George referred you to and use the code sample there as a basis for your code.

George Jonsson 18-Oct-14 9:35am

That would have been useful info in your original question.
Look at solution 2 and you should be able to solve your problem.

BillWoodruff 17-Oct-14 13:26pm

+5

BillWoodruff · Answer 2 · 2014-10-17T09:11:00

Assume:

0. you have WinForm, 'FrmViewColors

1. you have a PictureBox on a Form with its 'Image property set, 'pbxViewColors

2. you have a Label on the Form, 'lblColor

3. you create an EventHandler for the MouseMove Event of the PictureBox

C#

private Bitmap bmp;

private void FrmViewColors_Load(object sender, EventArgs e)
{
    // get the Bitmap from the PictureBox Image
    bmp = // left for you to figure out
}

// EventHandler
private void pbxViewColors_MouseMove(object sender, MouseEventArgs e)
{
    Color clr = bmp.GetPixel(e.X, e.Y);

    lblColor.Text = // left for you to figure out
}