Why is the image displayed incorrectly in PyQt5?

Question

PyQt

I wrote a simple program, it should display a black rectangle, but it displays a multi-colored one, why?

Here's what it outputs

main file

from PyQt5 import QtWidgets, QtGui, QtCore
from Window import Ui_MainWindow # Подключаем python файл окна
from PIL import Image, ImageQt
import sys # Библиотека для корректного завершения работы программы
import numpy as np


class MyWindow(QtWidgets.QMainWindow):  # Создаем класс окна наследуемый от класса главного окна в PyQt5

    def __init__(self):
        super(MyWindow, self).__init__()  # Инициализацию класса берем в PyQt5
        self.ui = Ui_MainWindow()  # Берем данные из ui для работы с виджетами
        self.ui.setupUi(self)
        img = np.int32(np.zeros((300, 500, 3)))
        print(img)
        img = Image.fromarray(img, mode='RGB')
        # img.show()

        img = ImageQt.ImageQt(img)
        self.ui.label.setPixmap(QtGui.QPixmap.fromImage(img))


app = QtWidgets.QApplication(sys.argv)  # Создаем объект QApplication
application = MyWindow()  # Создаем объект приложения
application.show()  # Отображаем окно
sys.exit(app.exec())  # Ждем закрытия окна

Window file

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'Window.ui'
#
# Created by: PyQt5 UI code generator 5.15.2
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 489)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(10, 10, 761, 391))
        self.label.setText("")
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(10, 420, 61, 51))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Graph"))
        self.pushButton.setText(_translate("MainWindow", "старт"))

Answer 1

Would show how it is displayed at least.