标签周围的窗口背景图像看起来很奇怪（PyQt5）

Question

我创建了一个窗口并为其添加了背景图像。我还在窗口中央添加了一个标签，我的问题是标签周围有一个奇怪的框，好像它有一种奇怪的背景颜色。我尝试使用这行代码修复它：

headline.setStyleSheet("background-color: transparent;")

但它什么也没做

这是我的代码：

import sys
from PyQt5.QtWidgets import QApplication, QDesktopWidget, QWidget, QLabel
from PyQt5.QtGui import QFont

BACKGROUND_IMAGE_PATH = "./documents/background_image.jpg"


def setWidgets(window: QWidget, window_geo: list):
    # Create the headline text
    headline = QLabel(window)
    headline.setText("A big lable here")

    font = QFont("Times New Roman")
    # Set font size to 60% of the window height
    font.setPointSize(int(window_geo[3] * 0.06))

    # Set the background color of the label to transparent
    headline.setStyleSheet("QLabel {\n"
                           "    background-color: transparent;\n"
                           "}")

    headline.setFont(font)
    headline.adjustSize()
    headline.move((window_geo[2] - headline.width()) // 2,
                  window_geo[1] + window_geo[3] // 5 - headline.height() // 2)


def getWindowValues():
    """
    getWindowValues getting the screen (width and height) and reduce it by 25 present to set the size of the app window
    """
    desktop = QDesktopWidget()
    screen_width = desktop.screenGeometry().width()
    screen_height = desktop.screenGeometry().height()

    window_width = int(screen_width * 0.75)
    window_height = int(screen_height * 0.80)

    # setting the x and y to be in the middle of the screen
    x = int(((screen_width - window_width) / 2) * 0.1)
    y = int((screen_height - window_height) / 2)

    return x, y, window_width, window_height


def main():
    stylesheet = f"QWidget {{background-image: url('{BACKGROUND_IMAGE_PATH}'); background-repeat: no-repeat; background-position: center;}}"

    app = QApplication(sys.argv)
    app.setStyleSheet(stylesheet)

    # getting the geometry of the window
    x, y, window_width, window_height = getWindowValues()

    window = QWidget()
    window.setWindowTitle("App name")

    setWidgets(window, [x, y, window_width, window_height])

    window.setGeometry(x, y, window_width, window_height)
    window.show()

    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

这是输出的图片：

Answer 1

1. 设置标签背景色为透明：

headline.setStyleSheet("background-color: rgba(0,0,0,0);")

2. 将标签的 autoFillBackground 属性设置为 False：

headline.setAutoFillBackground(False)