After the image cropping image size increases

https://docs.microsoft.com/zh-cn/dotnet/api/system.drawing.imaging.encoder.quality?view=netframework-4.8

 public ActionResult SaveVideoThumbnailFile(string keyValue,string strEntity)
        {


            Encoder myEncoder;
            EncoderParameter myEncoderParameter;
            EncoderParameters myEncoderParameters;
            ImageCodecInfo myImageCodecInfo;
            myEncoder = Encoder.Quality;
            myEncoderParameters = new EncoderParameters(1);
            myEncoderParameter = new EncoderParameter(myEncoder, 100L);
            myEncoderParameters.Param[0] = myEncoderParameter;
            //int width= int height, int offsetX, int offsetY
          
            var PostData = strEntity.ToJObject();
            int width = (int)PostData["width"];
            int height = (int)PostData["height"];
            int offsetX = (int)PostData["offsetX"];
            int offsetY = (int)PostData["offsetY"];
            string filePath = "/Resource/VideoThumbnailFile/" + keyValue;
            //创建路径
string firstfile = System.Web.HttpContext.Current.Server.MapPath("~" + ModelList[0].VideoUrl);
                myImageCodecInfo = GetEncoderInfo(MimeMapping.GetMimeMapping(firstfile));
                yfile = System.Web.HttpContext.Current.Server.MapPath("~" + model.VideoUrl);
                file = yfile.Replace("VideoFile", "VideoThumbnailFile");
                Bitmap refile = GetPartOfImageRec(yfile, width, height, offsetX, offsetY);
                refile.Save(file,myImageCodecInfo, myEncoderParameters);
            
 
        }

 ///  <Summary> /// taken an image portion specified
         /// </ Summary> /// <param name = "bitmapPathAndName"> Original image path name </ param> /// <param name = " width "> taken image width </ param> /// <param name =" height "> taken picture height </ param> /// <param name =" offsetX "> start X coordinate image taken </ param > /// <param name = "offsetY"> start capturing images of the Y coordinate </ param> /// <Returns> </ Returns> public   Bitmap GetPartOfImageRec ( String bitmapPathAndName,int width, int height, int
         
         
         
         
         
         
         
         offsetX, int offsetY)
        {
            Bitmap sourceBitmap = new Bitmap(bitmapPathAndName);
            Bitmap resultBitmap = new Bitmap(width, height);
            using (Graphics g = Graphics.FromImage(resultBitmap))
            {
                Rectangle resultRectangle = new Rectangle(0, 0, width, height);
                Rectangle sourceRectangle = new Rectangle(0 + offsetX, 0 + offsetY, width, height);
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                g.Clear(Color.White);
                g.DrawImage(sourceBitmap, resultRectangle, sourceRectangle, GraphicsUnit.Pixel);
            }
            return resultBitmap;
        }

 

 

 /// <summary> /// specified portion of an image taken /// </ summary> /// <param name = "bitmapPathAndName"> Original image path name </ param> /// <param name = " width "> width of the image taken </ param> /// <param name =" height "> taken picture height </ param> /// <param name =" offsetX "> X coordinate of the image taken beginning </ param > /// <param name = "offsetY"> Y coordinate of the start image taken </ param> /// <returns> </ returns> public Bitmap GetPartOfImageRec (string bitmapPathAndName, int width, int height, int offsetX, int offsetY ) {Bitmap sourceBitmap = new Bitmap (bitmapPathAndName); Bitmap resultBitmap = new Bitmap (width, height); using (Graphics g = Graphics.FromImage(resultBitmap))            {                Rectangle resultRectangle = new Rectangle(0, 0, width, height);                Rectangle sourceRectangle = new Rectangle(0 + offsetX, 0 + offsetY, width, height);                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;                g.Clear(Color.White);                g.DrawImage(sourceBitmap, resultRectangle, sourceRectangle, GraphicsUnit.Pixel);            }            return resultBitmap;        }Drawing.Drawing2D.SmoothingMode.HighQuality;                g.Clear(Color.White);                g.DrawImage(sourceBitmap, resultRectangle, sourceRectangle, GraphicsUnit.Pixel);            }            return resultBitmap;        }Drawing.Drawing2D.SmoothingMode.HighQuality;                g.Clear(Color.White);                g.DrawImage(sourceBitmap, resultRectangle, sourceRectangle, GraphicsUnit.Pixel);            }            return resultBitmap;        }