Qt Jpeg 파일 저장에 대해서 질문 드립니다.

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    a.addLibraryPath(QDir::currentPath() + "/imageformats");
    a.addLibraryPath(QDir::currentPath() + "/plugins");
 
    MainWindow w;
    w.show();
    qDebug() << a.libraryPaths();
 
    return a.exec();
}

QPixmap pixmap = QWidget::grab(rect());
    QImage image = pixmap.toImage();
    bool isSave = pixmap.save("E:/aa.jpeg", "jpeg", 100);
    bool isSave1 = image.save("E:/aa.jpeg", "jpeg", 100);
 
    QString a;
 
    if(isSave)
        a = "TRUE";
    else
        a = "FALSE";
 
    ui->lineEdit->setText(a);
 
    if(isSave1)
        a = "TRUE";
    else
        a = "FALSE";
 
    ui->lineEdit_2->setText(a);