Visualize an Image and copy a portion

[Polielia]

Hi, my goal is to visualize an image (e.g. in a QLabel), allow the use to select a portion of this image and visualize this portion in another QLabel. I have written the code, but I have a problem, the portion of image that I visualize is different from the selected part
CODE CPP

void Button1_nyq::on_selectimage_nyq_Hom_clicked() 
{
 
        Imagename = QFileDialog::getOpenFileName(this,tr("Open Image for Nyquist Test"), "", tr("Images (*.jpg)"));  //apro l'immagine
        //visualize the image in the first Label
        QPixmap image(Imagename);
        ui->ImageDisplay->setPixmap(image);  //ImageDisplay is the name of QLabel
    }
int count_selection=0; ///when it is not 0 it mean that the user want to make another selection and I hide the previous 
 
 
void Button1_nyq::mousePressEvent(QMouseEvent *e)
{
        if(count_selection!=0)
                rubberBand->hide();
        point1 = e->pos();
        rubberBand = new QRubberBand(QRubberBand::Rectangle,this );
}
 
void Button1_nyq::mouseMoveEvent(QMouseEvent *e)
{
        rubberBand->show();
        rubberBand->setGeometry(QRect(point1,e->pos()));
}
 
void Button1_nyq::mouseReleaseEvent(QMouseEvent *e)
{
        count_selection++;
        QRect rect; //selection rectangle
        rect.setTopLeft(point1);
        rect.setBottomRight(e->pos()));
       QPixmap image(rect.size());
        ui->ImageDisplay->render(&image,QPoint(0,0),QRegion(rect)); //copy the selected part into "image"
        ui->label_image_selected->setPixmap(image); //show "image" in the second QLabel

void Button1_nyq::on_selectimage_nyq_Hom_clicked() 
{

        Imagename = QFileDialog::getOpenFileName(this,tr("Open Image for Nyquist Test"), "", tr("Images (*.jpg)"));  //apro l'immagine
        //visualize the image in the first Label
        QPixmap image(Imagename);
        ui->ImageDisplay->setPixmap(image);  //ImageDisplay is the name of QLabel
    }
int count_selection=0; ///when it is not 0 it mean that the user want to make another selection and I hide the previous 


void Button1_nyq::mousePressEvent(QMouseEvent *e)
{
        if(count_selection!=0)
                rubberBand->hide();
        point1 = e->pos();
        rubberBand = new QRubberBand(QRubberBand::Rectangle,this );
}

void Button1_nyq::mouseMoveEvent(QMouseEvent *e)
{
        rubberBand->show();
        rubberBand->setGeometry(QRect(point1,e->pos()));
}

void Button1_nyq::mouseReleaseEvent(QMouseEvent *e)
{
        count_selection++;
        QRect rect; //selection rectangle
        rect.setTopLeft(point1);
        rect.setBottomRight(e->pos()));
       QPixmap image(rect.size());
        ui->ImageDisplay->render(&image,QPoint(0,0),QRegion(rect)); //copy the selected part into "image"
        ui->label_image_selected->setPixmap(image); //show "image" in the second QLabel

To copy to clipboard, switch view to plain text mode 

the actual results are:
Real image
http://imgur.com/9f6e0D3
Selected image
http://imgur.com/lysvM0q
Result
http://imgur.com/s0FydTc

How can I fix it?

[Santosh Reddy]

Some reason I cannot open the images, but any way here is simple working code

class ImageCopier : public QLabel
{
    Q_OBJECT
public:
    ImageCopier(QWidget * parent = 0)
        : QLabel(parent)
        , mRubberBand(new QRubberBand(QRubberBand::Rectangle, this))
    {
        setPixmap(QPixmap(QFileDialog::getOpenFileName(this, tr("Open Image for Nyquist Test"), "", tr("Images (*.jpg;*.png)"))));
    }
 
signals:
    void selectionChanged(const QPixmap & image);
 
protected:
    void mousePressEvent(QMouseEvent * event)
    {
        emit selectionChanged(QPixmap());
 
        mStart = event->pos();
        mRubberBand->setGeometry(QRect(mStart, QSize()));
        mRubberBand->show();
    }
 
    void mouseMoveEvent(QMouseEvent * event)
    {
        mRubberBand->setGeometry(QRect(mStart, event->pos()).normalized());
    }
 
    void mouseReleaseEvent(QMouseEvent * event)
    {
        mRubberBand->setGeometry(QRect(mStart, event->pos()).normalized());
        mRubberBand->hide();
        emit selectionChanged(grab(mRubberBand->geometry()));
    }
 
private:
    QRubberBand * mRubberBand;
    QPoint        mStart;
};

class ImageCopier : public QLabel
{
    Q_OBJECT
public:
    ImageCopier(QWidget * parent = 0)
        : QLabel(parent)
        , mRubberBand(new QRubberBand(QRubberBand::Rectangle, this))
    {
        setPixmap(QPixmap(QFileDialog::getOpenFileName(this, tr("Open Image for Nyquist Test"), "", tr("Images (*.jpg;*.png)"))));
    }

signals:
    void selectionChanged(const QPixmap & image);

protected:
    void mousePressEvent(QMouseEvent * event)
    {
        emit selectionChanged(QPixmap());

        mStart = event->pos();
        mRubberBand->setGeometry(QRect(mStart, QSize()));
        mRubberBand->show();
    }

    void mouseMoveEvent(QMouseEvent * event)
    {
        mRubberBand->setGeometry(QRect(mStart, event->pos()).normalized());
    }

    void mouseReleaseEvent(QMouseEvent * event)
    {
        mRubberBand->setGeometry(QRect(mStart, event->pos()).normalized());
        mRubberBand->hide();
        emit selectionChanged(grab(mRubberBand->geometry()));
    }

private:
    QRubberBand * mRubberBand;
    QPoint        mStart;
};

To copy to clipboard, switch view to plain text mode