I am not the best paint-brush !

to make a color picture to greyscale i make so.

Is here a other mode to grab moore quality?

Qt Code: 
  1. #include <QApplication>
  2. #include <QtGui>
  3. #include <QtCore> 
  4. #include <QCoreApplication>
  5.  
  6. int main(int argc, char *argv[])
  7. {
  8.     QApplication app(argc, argv);
  9.     QLabel *label = new QLabel("Hello Picasso");
  10.     QPixmap bw = QPixmap("test.png","",Qt::MonoOnly);
  11.  
  12.      QImage base0("test.png");
  13.      QImage base =  base0.convertToFormat(QImage::Format_MonoLSB,Qt::MonoOnly);
  14.      /////QPixmap display;
  15.      QPixmap xnew(base.width(),base.height());
  16.              xnew.fill();
  17.  
  18.                 /* paint B/W */
  19.                 QPainter painter;
  20.                 painter.begin(&xnew); 
  21.                ////// painter.setRenderHint(QPainter::Antialiasing);
  22.                 painter.drawImage(0,0,QImage("test.png"));
  23.                 painter.drawImage(base.width() / 2,0,base);
  24.                 painter.end();
  25.  
  26.     label->setPixmap(xnew);
  27.     label->show();
  28.     return app.exec();
  29. }
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