C # Lossless high-quality compressed pictures

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 <summary>//lossless compression picture///</summary>//<param name= "SFile" > Original picture </para m>//<param name= "Dfile" > Save location after compression </param>//<param name= "dheight" > Height &LT;/PARAM&G          T          <param name= "Dwidth" ></param>//<param name= "flag" > Compression quality (the smaller the number, the higher the compression rate) 1-100</param> <returns></returns> public static bool Getpicthumbnail (string sFile, string dfile, int dHe                        ight, int dwidth, int flag) {System.Drawing.Image ISource = System.Drawing.Image.FromFile (sFile);            ImageFormat Tformat = Isource.rawformat;            int SW = 0, SH = 0;            Scale Size tem_size = new Size (isource.width, isource.height); if (tem_size. Width > Dheight | | Tem_size. Width > Dwidth)//Change the * * to C # or manipulate the symbol {if (tem_size. Width * dheight) > (tem_size.              Height * dwidth))  {SW = Dwidth; SH = (Dwidth * tem_size. Height)/tem_size.                Width;                    } else {SH = Dheight; SW = (tem_size. Width * dheight)/tem_size.                Height; }} else {SW = tem_size.                Width; SH = Tem_size.            Height;            } Bitmap ob = new Bitmap (dwidth, dheight);            Graphics g = graphics.fromimage (OB);            G.clear (Color.whitesmoke);            g.compositingquality = compositingquality.highquality;            G.smoothingmode = smoothingmode.highquality;            G.interpolationmode = Interpolationmode.highqualitybicubic; G.drawimage (ISource, New Rectangle ((DWIDTH-SW)/2, (DHEIGHT-SH)/2, SW, SH), 0, 0, isource.width, Isource.height, Gr            Aphicsunit.pixel);            G.dispose (); The following code sets the compression quality EncoderParameters EP = new Encoderparamete when saving a pictureRS ();            long[] qy = new Long[1]; Qy[0] = flag;//Set the scale of the compression 1-100 encoderparameter Eparam = new Encoderparameter (System.Drawing.Imaging.Encoder.Qua            Lity, QY); Ep.            Param[0] = Eparam;                try {imagecodecinfo[] Arrayici = Imagecodecinfo.getimageencoders ();                ImageCodecInfo jpegiciinfo = null; for (int x = 0, x < arrayici.length, x + +) {if (arrayici[x].                        Formatdescription.equals ("JPEG")) {jpegiciinfo = arrayici[x];                    Break                }} isource.dispose (); if (jpegiciinfo! = null) {ob. Save (Dfile, Jpegiciinfo, EP);//dfile is the new path after compression} else {OB .                Save (Dfile, Tformat);            } return true;        } catch    {return false; } finally {ob.            Dispose ();   }        }

　　

C # Lossless high-quality compressed pictures