You could try to save the image using this approach
SaveFileDialog dialog = new SaveFileDialog();
if (dialog.ShowDialog() == DialogResult.OK)
{
int width = Convert.ToInt32(drawImage.Width);
int height = Convert.ToInt32(drawImage.Height);
Bitmap bmp = new Bitmap(width,height);
drawImage.DrawToBitmap(bmp, new Rectangle(0, 0, width, height);
bmp.Save(dialog.FileName, ImageFormat.Jpeg);
}
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