Qt 改变图片大小

void Setting_TabProduct::changeImageSize(int width,int height,QString imgFile)
{
     QPixmap pixmap(imgFile);
     if(width==pixmap.width()&&height==pixmap.height()){

     }else{

         QPixmap img=pixmap.scaled(width,height, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
         img.save(imgFile);
     }

}