How to split an image into smaller pieces in C#?

Question

How can I split an image into multiple sub images? Like, would I have to read the pixels and convert it to an image somehow?

For example:

If an image's dimension is 100px (width) and 180px (height) and I wanted to, say, split it as a 4x4, would I read the first 25px for the width and the first 45 px for the height and then just increment it correctly?

If so, what would I store the pixels to? More specifically, would it be saved as an array of bytes, images, etc?

Gabie

Possible duplicate of Image splitting into 9 pieces – Deci

Answer 1

You may try the following code sample (taken from https://stackoverflow.com/a/4118195/);

 for (int i = 0; i < 4; i++)
    {
        for (int y = 0; y < 4; y++)
        {
            Rectangle r = new Rectangle(i*(pictureBox1.Image.Width / 4), 
                                        y*(pictureBox1.Image.Height / 4), 
                                        pictureBox1.Image.Width / 4, 
                                        pictureBox1.Image.Height / 4);

            g.DrawRectangle(pen,r );

            list.Add(cropImage(pictureBox1.Image, r));
        }
    }

The other alternative is using BitMap.Clone, you may find an example in the following link.

Spontoon

Please attribute your sources in future. Failure to do so is seen as plagiarism. See stackoverflow.com/help/referencing – Messier

Answer 2

Use the Bitmap class to hold the image and its Clone method to cut out your rectangles of arbitrary size. As a Bitmap it comes with several convenience methods such as Save this overload will save to a stream another allows you to save it to a file.

Pork