New Post: Is MagickImage thread safe for reading?

using (MagickImage watermark = new MagickImage(@"C:\watermark.png"))
{
  Parallel.ForEach(Directory.GetFiles(@"c:\input", "*.png"), (string fileName) =>
  {
    using (MagickImage image = new MagickImage(fileName))
    {
      image.Composite(watermark, CompositeOperator.Over);
      image.Write(@"c:\output\uniquefilename.png");
    }
  });
}