C#: Watermark image has poor quality when saving JPEG -


i'm trying add watermark image , save @ best quality, when saving jpeg watermark has poor quality (but quality of main image good). 

string wtrsrc = @"d:\watermark.png"; string imgsrc = @"d:\image.jpg"; string imgoutjpg = @"d:\result.jpg";           string imgoutpng = @"d:\result.png";  // create new image bitmap imgoutput = new bitmap(imgsrc); graphics outputgraphics = graphics.fromimage(imgoutput);  // image quality outputgraphics.compositingquality = compositingquality.highquality; outputgraphics.interpolationmode = interpolationmode.highqualitybilinear; outputgraphics.smoothingmode = smoothingmode.highquality; outputgraphics.pixeloffsetmode = pixeloffsetmode.highquality;  // create watermark image system.drawing.image wtrmark = system.drawing.image.fromfile(wtrsrc);          // add waternark float wtrmarkx = 10; float wtrmarky = 10; outputgraphics.drawimage(wtrmark, wtrmarkx, wtrmarky);  //set jpeg quality     encoderparameters myencoderparameters = new encoderparameters(1); encoderparameter myencoderparameter = new encoderparameter(system.drawing.imaging.encoder.quality, 100l); myencoderparameters.param[0] = myencoderparameter;  // save result imgoutput.save(imgoutjpg, getencoder(imageformat.jpeg), myencoderparameters); imgoutput.save(imgoutpng, imageformat.png);  // clean wtrmark.dispose(); imgoutput.dispose(); outputgraphics.dispose();

......

    // imagecodecinfo      private imagecodecinfo getencoder(imageformat format)     {          imagecodecinfo[] codecs = imagecodecinfo.getimagedecoders();          foreach (imagecodecinfo codec in codecs)         {             if (codec.formatid == format.guid)             {                 return codec;             }         }         return null;     }

png saving works well, need save jpeg. here's difference between png , jpeg http://i.stack.imgur.com/cqwgz.jpg

i followed article http://www.codeproject.com/articles/2927/creating-a-watermarked-photograph-with-gdi-for-net , same result.

is there way make watermark on jpeg looks good?

first intall imagemagick in c:\imagemagick folder in windows using

http://www.imagemagick.org/download/binaries/imagemagick-6.8.8-7-q16-x86-dll.exe

while installation add c:\imagemagick; in path enviornment variable

and use below code b service

    using system.io;     using system.drawing;      [webmethod]         public byte[] watermarkimage(byte[] image)         {     memorystream ms = new memorystream(image);     image image2 = image.fromstream(ms);     image2.save(server.mappath("~") + "\\imagetest.jpg");     string strcmdtext;     strcmdtext = "/c convert.exe -draw \"gravity south fill black text 0,0 'parth' \" \"" + server.mappath("~") +"\\imagetest.jpg \" \""+server.mappath("~") +"\\imagetest_result.jpg \"";     system.diagnostics.process.start("cmd.exe", strcmdtext);     system.threading.thread.sleep(1000);     byte[] imgdata = system.io.file.readallbytes(server.mappath("~") +"\\imagetest_result.jpg");     return imgdata;         }

use in web page

      protected void button1_click(object sender, eventargs e)          {              if (this.fileupload1.hasfile)              {         if (fileupload1.postedfile.contenttype == "image/jpeg")         {             if (fileupload1.postedfile.contentlength < 512000)             {                 string filename = path.getfilename(fileupload1.filename);                 fileupload1.saveas(server.mappath("~") + "\\" + filename);                 watermark w = new watermark();                 byte[] b = w.watermarkimage(getbytesfromfile(server.mappath("~") + "\\" + filename));                 memorystream ms = new memorystream(b);                 system.drawing.image image2 = system.drawing.image.fromstream(ms);                 image2.save(server.mappath("~") + "\\imagetest_op.jpg");                 image1.imageurl = "imagetest_op.jpg";             }                  }              }          }

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