Considering the following code

from PyQt5.QtWidgets import QMainWindow, QLabel, QSizePolicy, QApplication 
from PyQt5.QtGui import QPixmap, QImage                                
from PyQt5.QtCore import Qt                                                                                              
import numpy as np                                                     
import sys



class Test(QMainWindow):                                                                                                                                                                                       

 def __init__(self):                                                                                                                                                                                        
     super().__init__()                                                                                                                                                                                     
     self.initUI()                                                                                                                                                                                          

 def initUI(self):                                                                                                                                                                                          
     self.setGeometry(10,10,640, 400)                                                                                                                                                                       

     pixmap_label = QLabel()                                                                                                                                                                                
     pixmap_label.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Ignored)                                                                                                                                   
     pixmap_label.resize(640,400)                                                                                                                                                                           
     pixmap_label.setAlignment(Qt.AlignCenter)                                                                                                                                                              

     im_np = np.ones((1800,2880,3),dtype=uint8)                                                                                                                                                                                  
     im_np = np.transpose(im_np, (1,0,2))                                                                                                                                                                              
     qimage = QImage(im_np, im_np.shape[1], im_np.shape[0],                                                                                                                                                 
                     QImage.Format_RGB888)                                                                                                                                                                 
     pixmap = QPixmap(qimage)                                                                                                                                                                               
     pixmap = pixmap.scaled(640,400, Qt.KeepAspectRatio)                                                                                                                                                    
     pixmap_label.setPixmap(pixmap)                                                                                                                                                                         

     self.setCentralWidget(pixmap_label)                                                                                                                                                                    
     self.show()                                                                                                                                                                                            



def main():                                                                                                                                                                                                    
  app = QApplication(sys.argv)                                                                                                                                                                               
  win = Test()                                                                                                                                                                                               
  sys.exit(app.exec_())                                                                                                                                                                                      



if __name__=="__main__":                                                                                                                                                                                       
  main()  
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I get the following error

TypeError: arguments did not match any overloaded call: QImage(): too many arguments QImage(QSize, QImage.Format): argument 1 has unexpected type 'numpy.ndarray' QImage(int, int, QImage.Format): argument 1 has unexpected type 'numpy.ndarray' QImage(bytes, int, int, QImage.Format): argument 1 has unexpected type 'numpy.ndarray'
QImage(sip.voidptr, int, int, QImage.Format): argument 1 has unexpected type 'numpy.ndarray' QImage(bytes, int, int, int, QImage.Format): argument 1 has unexpected type 'numpy.ndarray'
QImage(sip.voidptr, int, int, int, QImage.Format): argument 1 has unexpected type 'numpy.ndarray' QImage(List[str]): argument 1 has unexpected type 'numpy.ndarray' QImage(str, format: str = None): argument 1 has unexpected type 'numpy.ndarray' QImage(QImage): argument 1 has unexpected type 'numpy.ndarray' QImage(Any): too many arguments

According to this post this can be caused by numpy creating a view. Modifying the lines

 im_np = np.array(img)                                                                                                                                                                                  
 im_np = np.transpose(im_np, (1,0,2))                                                                                                                                                                              
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To

im_np = np.array(img)                                                                                                                                                                                  
im_np = np.transpose(im_np, (1,0,2))                                                                                                                                                                              
im_np_cpy = np.copy(im_np)     
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Produces the same error. To test that I am not passing a view I print the result of the test

im_np_cpy.base is im_np
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and it's False. The image is visualised correctly with cv2. I am clearly missing something, any idea what?

Cheers!

I added a copy after the transpose like this:

im_np = np.transpose(im_np,(1,0,2)).copy()
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and that worked for me.