Pyqt Different Image Autoscaling Modes

Let's say we have a QLabel with QPixmap label = QLabel Pixmap = QPixmap('filepath') label.setPixmap(Pixmap) I already mentioned that by using label.setScaledContents(True) We ca

Solution 1:

Try it:

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore    import *
from PyQt5.QtGui     import * 

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        centralWidget = QWidget()
        self.setCentralWidget(centralWidget)  

        self.label  = QLabel() 
        self.pixmap = QPixmap("head.jpg")
        self.label.setPixmap(self.pixmap.scaled(self.label.size(),
                Qt.KeepAspectRatio, Qt.SmoothTransformation))

        self.label.setSizePolicy(QSizePolicy.Expanding,
                QSizePolicy.Expanding)
        self.label.setAlignment(Qt.AlignCenter)
        self.label.setMinimumSize(100, 100) 

        layout = QGridLayout(centralWidget)    
        layout.addWidget(self.label)        

    def resizeEvent(self, event):
        scaledSize = self.label.size()                       
        scaledSize.scale(self.label.size(), Qt.KeepAspectRatio)
        if not self.label.pixmap() or scaledSize != self.label.pixmap().size():
            self.updateLabel()    

    def updateLabel(self):
        self.label.setPixmap(self.pixmap.scaled(        
                self.label.size(), Qt.KeepAspectRatio,
                Qt.SmoothTransformation))

if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())