Question

我有一个QPainterPath，我想裁剪一个QPixmap图像。这段代码对我有用，但是我想使用PyQt5内置功能就像没有numpy的面具

with

Answer 1

替换遮罩的一种可能方法是使用QPainter setClipPath：

from PyQt5 import QtCore, QtGui

if __name__ == '__main__':
    image = QtGui.QImage('input.png')
    output = QtGui.QImage(image.size(), QtGui.QImage.Format_ARGB32)
    output.fill(QtCore.Qt.transparent)
    painter = QtGui.QPainter(output)

    points = [(444, 203), (623, 243), (691, 177), (581, 26), (482, 42)]
    polygon = QtGui.QPolygonF([QtCore.QPointF(*point) for point in points])

    path = QtGui.QPainterPath()
    path.addPolygon(polygon)
    painter.setClipPath(path)
    painter.drawImage(QtCore.QPoint(), image)
    painter.end()
    output.save('out.png')

Answer 2

从上面回答后，我对代码进行了一些调整，现在看起来像这样：

    path = lips_contour_path
    image = QImage('frontal_2.jpg')
    output = QImage(image.size(), QImage.Format_ARGB32)
    output.fill(Qt.transparent)
    painter = QPainter(output)
    painter.setClipPath(path)
    painter.drawImage(QPoint(), image)
    painter.end()
    # To avoid useless transparent background you can crop it like that:
    output = output.copy(path.boundingRect().toRect())
    output.save('out.png')

如何使用QPainterPath裁剪图像而不保存其余图像

2 个答案: