C # cut produces high-quality scaled pictures

/// <summary>        ///High-quality zoom picture/// </summary>        /// <param name= "Originfilepath" >path of the source graph</param>        /// <param name= "Targetfilepath" >path to store thumbnails</param>        /// <param name= "Destwidth" >picture width after zooming</param>        /// <param name= "Destheight" >image height after zooming</param>        /// <returns>Indicates whether this operation was successful</returns>         Public Static BOOLTosuolue (System.IO.Stream OStream,stringTargetfilepath,intTowidth,inttoheight) {            //System.Drawing.Image originimage = System.Drawing.Image.FromFile (Originfilepath);System.Drawing.Image Originimage =System.Drawing.Image.FromStream (OStream); System.Drawing.Imaging.ImageFormat Thisformat=Originimage.rawformat; //Scale by scaling            intx =0, y =0; intow =Originimage.width; intOh =Originimage.height; if((Double) OW/(Double) Oh > (Double) Towidth/(Double) toheight) {Oh=Originimage.height; ow= Originimage.height * Towidth/Toheight; Y=0; X= (Originimage.width-ow)/2; }            Else{ow=Originimage.width; Oh= Originimage.width * Toheight/Towidth; X=0; Y= (Originimage.height-oh)/2; } Bitmap BT=NewBitmap (Towidth, toheight);//Create a bitmap instance based on the specified size            using(Graphics g =Graphics.fromimage (BT))                {g.clear (color.white); //set the drawing quality of the canvasG.compositingquality =System.Drawing.Drawing2D.CompositingQuality.HighQuality; G.smoothingmode=System.Drawing.Drawing2D.SmoothingMode.HighQuality; G.interpolationmode=System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; G.drawimage (Originimage,NewRectangle (0,0, Towidth, toheight),NewSystem.Drawing.Rectangle (x, Y, Ow, OH), System.Drawing.GraphicsUnit.Pixel);            G.dispose (); } System.Drawing.Imaging.EncoderParameters encoderparams=NewSystem.Drawing.Imaging.EncoderParameters ();//get the built -in encoder            Long[] quality =New Long[1]; quality[0] = -; System.Drawing.Imaging.EncoderParameter Encoderparam=NewSystem.Drawing.Imaging.EncoderParameter (System.Drawing.Imaging.Encoder.Quality, quality); encoderparams.param[0] =Encoderparam; //Try//{                //get the ImageCodecInfo object that contains information about the built-in image codecsystem.drawing.imaging.imagecodecinfo[] Arrayici =System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders (); System.Drawing.Imaging.ImageCodecInfo Jpegici=NULL;  for(inti =0; i < arrayici.length; i++)                {                    if(Arrayici[i]. Formatdescription.equals ("JPEG") ) {Jpegici= Arrayici[i];//set to JPEG encoding                         Break; }                }                if(Jpegici! =NULL)//Save thumbnail image{bt.                Save (Targetfilepath, Jpegici, encoderparams); }                Else{bt.                Save (Targetfilepath, Thisformat);                } originimage.dispose (); return true; //}            //catch (System.Runtime.InteropServices.ExternalException E1)//GDI + General error occurred//{            //return false; //}            //catch (Exception E2)//{            //return false; //}}

C # cut produces high-quality scaled pictures