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Thread: How do I resize an image?

  1. #1

    Thread Starter
    Member
    Join Date
    Feb 2021
    Posts
    36

    How do I resize an image?

    I have been looking all over and cannot find a way to resize and save an image from a picturebox
    the open file code is this
    Code:
           private void open1_Click(object sender, EventArgs e)
            {
                openImage = new OpenFileDialog();
                openImage.InitialDirectory = "C:\\";
                openImage.Filter = "Image Files (*.jpg, *.jpeg, *.jpe, *.jfif, *.png) | *.jpg; *.jpeg; *.jpe; *.jfif; *.png; *.gif; *.bmp";
                openImage.FilterIndex = 2;
                openImage.RestoreDirectory = true;
                
                if (openImage.ShowDialog() == DialogResult.OK)
                {
                    try
                    {
                        preview.Image = Image.FromFile(openImage.FileName);
                        imageFile = openImage.FileName;
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
                    }
                }
            }
    and the save file code is

    Code:
            private void save1_Click(object sender, EventArgs e)
            {
                string firstText = topText.Text;
                string secondText = bottomText.Text;
                if (preview.Image == null)
                {
                    MessageBox.Show("Please Load an image before saving!", "Error!");
                    return;
                } 
                Bitmap bitmap = (Bitmap)Image.FromFile(imageFile);
                RectangleF TopSize = new RectangleF(0, 10, bitmap.Width, 400);
                RectangleF BottomSize = new RectangleF(0, bitmap.Height -100, bitmap.Width, 400);
                SaveFileDialog saveImage = new SaveFileDialog();
                saveImage.FileName = "*";
                saveImage.DefaultExt = "bmp";
                saveImage.ValidateNames = true;
                saveImage.Filter = "Bitmap Image (.bmp)|*.bmp |Gif Image (.gif)|*.gif |Jpg Image (.jpg)|*.jpg |Png Image (.png)|*.png";
                if (saveImage.ShowDialog() == DialogResult.OK)
                {
                    using (Graphics graphics = Graphics.FromImage(bitmap))
                    {
                        using (Font memeFont = new Font("Impact", 24, FontStyle.Bold, GraphicsUnit.Point))
                        {
                            graphics.DrawString(firstText, memeFont, Brushes.White, TopSize);
                            graphics.DrawString(secondText, memeFont, Brushes.White, BottomSize);
                        }
                        bitmap.Save(saveImage.FileName);
                    }
                }
            }

  2. #2
    .NUT jmcilhinney's Avatar
    Join Date
    May 2005
    Location
    Sydney, Australia
    Posts
    107,636

    Re: How do I resize an image?

    You don't resize an Image object. You create a new Bitmap object with the desired dimensions, create a Graphics object from it and use that to draw the other Image onto it. You then use that new Image in place of the old.

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