In this article, we will see how to display only cropped square image from any rectangular image with any width and height i.e 
In order to do so we have to do the following steps : 1. Load the image 2. Crop image to make it square 3. Mask it and make perfect square from it using Painter 4. Convert it back to pixmap image
Code – For this original image below is the code : 
Python3
# importing librariesfrom PyQt5.QtCore import *from PyQt5.QtGui import *from PyQt5.QtWidgets import *# function to alter imagedef mask_image(imgdata, imgtype ='png', size = 64): # Load image image = QImage.fromData(imgdata, imgtype) # convert image to 32-bit ARGB (adds an alpha # channel ie transparency factor): image.convertToFormat(QImage.Format_ARGB32) # Crop image to a square: imgsize = min(image.width(), image.height()) rect = QRect( (image.width() - imgsize) / 2, (image.height() - imgsize) / 2, imgsize, imgsize, ) image = image.copy(rect) # Create the output image with the # same dimensions and an alpha channel # and make it completely transparent: out_img = QImage(imgsize, imgsize, QImage.Format_ARGB32) out_img.fill(Qt.transparent) # Create a texture brush and paint a circle # with the original image onto # the output image: brush = QBrush(image) # Paint the output image painter = QPainter(out_img) painter.setBrush(brush) # Don't draw an outline painter.setPen(Qt.NoPen) # drawing square painter.drawRect(0, 0, imgsize, imgsize) # closing painter event painter.end() # Convert the image to a pixmap and rescale it. pr = QWindow().devicePixelRatio() pm = QPixmap.fromImage(out_img) pm.setDevicePixelRatio(pr) size *= pr pm = pm.scaled(size, size, Qt.KeepAspectRatio, Qt.SmoothTransformation) # return back the pixmap data return pmclass Window(QWidget): """Simple window that shows our masked image and text label.""" def __init__(self): super().__init__() # setting up the geometry self.setGeometry(100, 100, 600, 400) # image path imgpath = "image.png" # loading image imgdata = open(imgpath, 'rb').read() # calling the function pixmap = mask_image(imgdata) # creating label self.ilabel = QLabel(self) # putting image on label self.ilabel.setPixmap(pixmap) # moving the label self.ilabel.move(240, 180) # another label to put text self.tlabel = QLabel('This is cropped image', self) self.tlabel.move(200, 250)# main functionif __name__ == '__main__': import sys from PyQt5.QtWidgets import QApplication # app created app = QApplication(sys.argv) w = Window() w.show() # begin the app sys.exit(app.exec_()) |
Output : 