python， Pyqt5的图像显示问题

Question

我想使用python的pyqt5编写一个QLabel显示图片，直接读取图片为QPixmap后用setPixmap显示图片的时候正常，在使用PIL.image读取图片为PIL.Image类型后再用ImageQt.toqpixmap转换为QPixmap后就无法显示图片了，程序跑了直接退出也不报错，debug也是直接退出。这个有什么解决方案吗。ps:不直接使用Qpixmap是因为某个项目里面用到PIL.Image进行运算，运算后需要转换为Qpixmap进行显示
补充，我自己在找解决办法的时候发现，我将PIL.Image类型转化为ndarray后直接用matplotlib进行显示是可以的，但是转换为Pixmap又不行了。后面我尝试随机生成一个RGB数据数组转换为Pixmap发现也无法显示。由于程序直接退出不报错，不知道问题所在，下面是我的测试代码。

from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 300)
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(60, 90, 261, 151))
        self.label.setStyleSheet("background-color:rgb(85, 170, 255)")
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(50, 30, 75, 23))
        self.pushButton.setObjectName("pushButton")

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

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.label.setText(_translate("Form", "Label"))
        self.pushButton.setText(_translate("Form", "PushButton"))

import sys

from PIL import Image, ImageQt
from PyQt5 import QtGui, QtCore, QtWidgets
from PyQt5.QtWidgets import QMainWindow
import numpy as np

from testLabel import Ui_Form
import cv2

class MyMainForm(QMainWindow, Ui_Form):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        self.pushButton.clicked.connect(self.openPicture)


    def openPicture(self):

        # pix = Image.open('result.jpg')
        # pix = ImageQt.toqpixmap(pix)
        # img = cv2.imread('result.jpg')
        # pix = QtGui.QPixmap('result.jpg')
        # self.label.setScaledContents(True)
        img = np.random.randint(0, 255, [10, 60, 3], np.uint8)
        img = img.astype("uint8")
        img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
        img = QtGui.QImage(img, img.shape[1], img.shape[0], img.shape[1] * 3, QtGui.QImage.Format_RGB888)


        self.label.setPixmap(img)


if __name__ == '__main__':
    QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)
    app = QtWidgets.QApplication(sys.argv)
    my = MyMainForm()
    my.show()
    sys.exit(app.exec_())

Answer 1

你的代码中，使用QImage对象替换了QPixmap对象来显示图片，由于QImage对象是只读的，因此您无法在QImage对象上执行操作。你需要将QImage对象转换为QPixmap对象，然后再将其设置为标签的图像。这是修改以后的代码

from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 300)
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(60, 90, 261, 151))
        self.label.setStyleSheet("background-color:rgb(85, 170, 255)")
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(50, 30, 75, 23))
        self.pushButton.setObjectName("pushButton")

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

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.label.setText(_translate("Form", "Label"))
        self.pushButton.setText(_translate("Form", "PushButton"))

import sys

from PIL import Image, ImageQt
from PyQt5 import QtGui, QtCore, QtWidgets
from PyQt5.QtWidgets import QMainWindow
import numpy as np

from testLabel import Ui_Form
import cv2

class MyMainForm(QMainWindow, Ui_Form):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        self.pushButton.clicked.connect(self.openPicture)


    def openPicture(self):

        # pix = Image.open('result.jpg')
        # pix = ImageQt.toqpixmap(pix)
        # img = cv2.imread('result.jpg')
        # pix = QtGui.QPixmap('result.jpg')
        # self.label.setScaledContents(True)
        img = np.random.randint(0, 255, [10, 60, 3], np.uint8)
        img = img.astype("uint8")
        img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
        img = QtGui.QImage(img, img.shape[1], img.shape[0], img.shape[1] * 3, QtGui.QImage.Format_RGB888)

        pixmap = QtGui.QPixmap.fromImage(img)
        self.label.setPixmap(pixmap)


if __name__ == '__main__':
    QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)
    app = QtWidgets.QApplication(sys.argv)
    my = MyMainForm()
    my.show()
    sys.exit(app.exec_())

如果能解决问题，望采纳