def shrinkImage(self):
	'''
	缩小图片
	:return:
	'''
	scale = 0.8		#每次缩小20%
	img = QImage(self.path)  #创建图片实例
	mgnWidth = int(originWidth * scale)  
	mgnHeight = int(originHeight * scale)  #缩放宽高尺寸
	size = QSize(mgnWidth, mgnHeight)
 
	pixImg = QPixmap.fromImage(img.scaled(size, Qt.IgnoreAspectRatio))    #修改图片实例大小并从QImage实例中生成QPixmap实例以备放入QLabel控件中
	
    self.imageLabel.resize(mgnWidth, mgnHeight)
	self.imageLabel.setPixmap(pixImg)