Quickly determine whether a given path is an image

IsImage

        public static bool IsImage(string path)
        {
            Dictionary<string, string[]> knownImageHeaders = new Dictionary<string, string[]>()
            {
                {"jpg", new [] { "FF", "D8" } },
                {"bmp", new [] { "42", "4D" } },
                {"gif", new [] { "47", "49", "46" } },
                {"tif", new [] { "49", "49", "2A" } },
                {"png", new [] { "89", "50", "4E", "47", "0D", "0A", "1A", "0A" } },
            };

            using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
            {
                fs.Seek(0, SeekOrigin.Begin);

                List<string> bytesIterated = new List<string>();
                for (int i = 0; i < 8; i++)
                {
                    bytesIterated.Add(fs.ReadByte().ToString("X2"));

                    bool isImage = knownImageHeaders.Values.Any(img => !img.Except(bytesIterated).Any());
                    if (isImage)
                        return true;
                }

                return false;
            }
        }