Drawing utilities. How to convert an image to a byte array

DrawingUtils.cs

public static class DrawingUtils
{
    // Extension method to convert an image into a byte array
    public static byte[] ToBytes(this Bitmap image, ImageFormat imageFormat = null)
    {
        
        if (imageFormat != null)
        {
            using (MemoryStream stream = new MemoryStream())
            {
                image.Save(stream, imageFormat);
                stream.Flush();
                return Image.GetInstance(stream.ToArray());
            }
        }
        ImageConverter converter = new ImageConverter();            
        return Image.GetInstance((byte[])converter.ConvertTo(image, typeof(byte[])));
        
    }

}