Error in declaring a bitmap as the .image of a picture box

sebogawa

I have a function that takes the image in a picture box and converts it to a bitmap (System.Drawing.Image Picturebox.Image to System.Drawing.Bitmap) with the following code:

private void freezeFrame_MouseClick(object sender, MouseEventArgs e)
{
Bitmap refImage = new Bitmap(freezeFrame.Image); //freezeFrame = picture box control

        int rangeLimit = 20;
        txtMouseX.Text = e.X.ToString();
        txtMouseY.Text = e.Y.ToString();
        int mouseX = int.Parse(txtMouseX.Text);
        int mouseY = int.Parse(txtMouseY.Text);

       
        
        Color currentPixel = (refImage.GetPixel(mouseX, mouseY));
       
       curPixelRed.Text = currentPixel.R.ToString();
       curPixelGreen.Text = currentPixel.G.ToString();
       curPixelBlue.Text = currentPixel.B.ToString();

        redMinUpDown.Value = currentPixel.R - rangeLimit;
        redMaxUpDown.Value = currentPixel.R + rangeLimit;

        greenMinUpDown.Value = currentPixel.G - rangeLimit;
        greenMaxUpDown.Value = currentPixel.G + rangeLimit;

        blueMinUpDown.Value = currentPixel.B - rangeLimit;
        blueMaxUpDown.Value = currentPixel.B + rangeLimit;

        
    }

I keep getting an invalid parameter error for the first line of the function. What am I doing wrong?

Sibugathulla

Please Update your first line as follows :mad:

Bitmap refImage = new Bitmap((Bitmap)freezeFrame.Image);

Or Convert Image to Bitmap and use this Bitmap as parameter.

©Something Different

sebogawa

How can I convert the image? Sorry for the noobish question...

Christian Graus

Um.. with the code he gave you to do it ?

Christian Graus Driven to the arms of OSX by Vista. "I am new to programming world. I have been learning c# for about past four weeks. I am quite acquainted with the fundamentals of c#. Now I have to work on a project which converts given flat files to XML using the XML serialization method" - SK64 ( but the forums have stuff like this posted every day )

sebogawa

he said that I can do what he told me too or convert the picturebox image to a bitmap...i still get the invalid parameters error when i click on the image ....how do i do the picturebox image to bitmap conversion...i think there is something wrong with my code that is causeing the error

Luc Pattyn

Hi, several comments: 1.

sebogawa wrote:

txtMouseX.Text = e.X.ToString(); int mouseX = int.Parse(txtMouseX.Text);

What a waste. You already have e.X as a number, why do you need to parse a string then. Just write

int mouseX = e.X;
txtMouseX.Text = mouseX.ToString();

2. Bitmap refImage = new Bitmap(freezeFrame.Image); You claim the problem is here, I doubt that. There are two ways this could fail: a) freezeFrame.Image being null would result in a NullReferenceException b) freezeFrame.Image being of some special ImageFormat (such as EMF) might cause problems, I'm not sure though. 3. Color currentPixel = (refImage.GetPixel(mouseX, mouseY)); would throw an ArgumentOutOfRangeException when mouseX and/or mouseY fall outside the image. 4. redMinUpDown.Value = currentPixel.R - rangeLimit; may cause problems since the lowest achievable value is negative (-rangeLimit). If Value is set outside [Minimum,Maximum] an ArgumentOutOfRangeException will be thrown. Overall, your code is low-quality as it lacks a lot of checks. :)

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