Image.FromStream(stream1) 将数据流转成图片时报错：内存不足

Question

将数据流转成图片时报错，内存不足，不知道怎么处理，求大神指点

 //解析json串
                JObject JsonTrackData = (JObject)JsonConvert.DeserializeObject(TrackData);
                //获取imageInfo
                string imgStrData = JsonTrackData["result"]["imageInfo"].ToString();
                //得到图片字节码
                    //Base6解码
                    byte[] bytes_data = Convert.FromBase64String(imgStrData);
                    string urlData = Server.MapPath("~/TrackImage/Data.png");
                    MemoryStream stream1 = new MemoryStream(bytes_data);

                    Bitmap btm = new Bitmap(stream1);

                    stream1.Position = 1333300;
                    System.Drawing.Image imgData = Image.FromStream(stream1);//报错内存不足
                    imgData.Save(urlData, System.Drawing.Imaging.ImageFormat.Png);//xxx.jpeg为文件名

Answer 1

 <img src="data:image/jpeg;base64,这里加还没有解码的imgStrData">