public ReadOnlyCollection<double> CompareImageFromPdf(string path, string testImage) { List<double> match = new List<double>(); List<System.Drawing.Image> ImgList = new List<System.Drawing.Image>(); ImgList = GetImages(path); ImgList.ForEach(img => img.Save("Image_" + Guid.NewGuid() + ".bmp")); ImgList.ForEach(img => match.Add(ImageTest(testImage, img))); return match.AsReadOnly(); }