QString fileName = QFileDialog::getOpenFileName(this,
      tr("Open Image file"),
      tr("Open desired Image file"),
      tr("Images (*.png *.jpeg *.jpg *.tiff *.tif *.pbm *.pgm *.ppm *.pnm *.xbm *xpm *.bmp *.gif )"));

    if (fileName.isEmpty())
      return;

    mImage = QImage(fileName);
    mImage = mImage.convertToFormat(QImage::Format_ARGB32_Premultiplied);
    mDisplayedImage = QImage(mImage.size(), mImage.format());

    bool valid = !mImage.isNull();


    if (!valid) {
      ui->imageLabel->setText(tr("No Image loaded!"));
  }else{
      ui->imageLabel->setPixmap(QPixmap::fromImage(mDisplayedImage));

  }