file.h:
Qt Code: 
  1. QImage background;
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file.cxx:
Qt Code: 
  1. this->background = QImage(size, QImage::Format_RGB32);
  2.   this->background.fill(Qt::black);
  3.   std::vector<double>::const_iterator it = values.begin();
  4.   for (int j=0 ; j<this->original_size[1] ; j++)
  5.     for (int i=0 ; i<this->original_size[0] ; i++,it++)
  6.       if (*it >= 1)
  7. 	for (int ii=0 ; ii<factor ; ii++)
  8. 	  for (int jj=0 ; jj<factor ; jj++)
  9. 	    this->background.setPixel(i*factor+ii, j*factor+jj, Qt::green);
  10.   int g=0, b=0;
  11.   for (int j=0 ; j<background.height() ; j++)
  12.     for (int i=0 ; i<background.width() ; i++)
  13.       if (background.pixel(i,j) == Qt::black)
  14. 	b++;
  15.       else if (background.pixel(i,j) == Qt::green)
  16. 	g++;
  17.   printf("%d black pixels and %d green pixels\n", b, g);
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Expected result: some green pixels among black ones (I checked there really are some points for which *it == 1)
Actual result: 0 0 !