Python 如何使用QPainterPath裁剪图像而不保存图像的其余部分
我有一个QPainterPath,我想裁剪一个QPixmap图像。 这段代码对我有用,但我想使用PyQt5内置功能 像面具没有屁股Python 如何使用QPainterPath裁剪图像而不保存图像的其余部分,python,pyqt,pyqt5,qpixmap,qpainterpath,Python,Pyqt,Pyqt5,Qpixmap,Qpainterpath,我有一个QPainterPath,我想裁剪一个QPixmap图像。 这段代码对我有用,但我想使用PyQt5内置功能 像面具没有屁股 # read image as RGB and add alpha (transparency) im = Image.open("frontal_1.jpg").convert("RGBA") # convert to numpy (for convenience) imArray = numpy.asarray(im) # create mask polyg
# read image as RGB and add alpha (transparency)
im = Image.open("frontal_1.jpg").convert("RGBA")
# convert to numpy (for convenience)
imArray = numpy.asarray(im)
# create mask
polygon = [(444, 203), (623, 243), (691, 177), (581, 26), (482, 42)]
maskIm = Image.new('L', (imArray.shape[1], imArray.shape[0]), 0)
ImageDraw.Draw(maskIm).polygon(polygon, outline=1, fill=1)
mask = numpy.array(maskIm)
...
newIm = Image.fromarray(newImArray, "RGBA")
newIm.save("out.png")
替换遮罩的一种可能方法是使用QPainter的setClipPath()方法:
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')
在上面的回答之后,我稍微调整了我的代码,现在它看起来像:
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')