Question

我想用PIL加载图像，应用一些过滤然后在GUI上显示图像。

我写了一些示例应用程序：

from PyQt4 import QtCore, QtGui
from PIL import Image, ImageQt

class TwoDToThreeD(QtGui.QWidget):

    def __init__(self):

        QtGui.QWidget.__init__(self)
        layout = QtGui.QGridLayout()

        self.btnOpen = self.createButton("Open File", self.open)

        layout.addWidget(self.btnOpen, 4, 0)

        self.imageLabel = QtGui.QLabel()
        self.imageLabel.setBackgroundRole(QtGui.QPalette.Base)
        self.imageLabel.setSizePolicy(QtGui.QSizePolicy.Ignored, QtGui.QSizePolicy.Ignored)
        self.imageLabel.setScaledContents(True)

        layout.addWidget(self.imageLabel, 0, 2, 4, 1)
        layout.setColumnStretch(1, 10)
        layout.setColumnStretch(2, 20)

        self.setLayout(layout)

    def createButton(self, text, member):
        button = QtGui.QPushButton(text)
        button.clicked.connect(member)
        return button


    def open(self):
        fileName = (QtGui.QFileDialog.getOpenFileName(self, "Open File", QtCore.QDir.currentPath()))
        if fileName:
            print (fileName)
            self.imgPil = Image.open(str(fileName))

            # print (PIL.VERSION)

            print (self.imgPil.format, self.imgPil.size, self.imgPil.mode)
            # imgPil.show()
            img_tmp = ImageQt.ImageQt(self.imgPil)

            image = QtGui.QImage(img_tmp)

            if image.isNull():
                QtGui.QMessageBox.information(self, "Image Viewer", "Cannot load %s." % fileName)
                return

            self.imageLabel.setPixmap(QtGui.QPixmap.fromImage(image))



if __name__ == '__main__':

    import sys

    app = QtGui.QApplication(sys.argv)
    dialog = TwoDToThreeD()
    dialog.show()
    sys.exit(app.exec_())

加载* .png效果很好。但是当我尝试加载* .jpg python时崩溃：

python.exe has stopped working
A problem caused the program to stop working correctly.
Windows will close the program and notify you if a solution is
available.

我在Windows 8.1 64Bit上使用python 2.7 64bit，python 2.7 32bit和python 3.4 64bit尝试了相同的源代码。

对于所有3个版本，我得到相同的结果。

是否有人遇到类似问题或知道解决方案？我甚至无法调试代码，因为它直到＆＃34; end＆＃34;然后崩溃:(

Answer 1

基于github

的示例

def pil2pixmap(self,im):
        if im.mode == "RGB":
            pass
        elif im.mode == "L":
            im = im.convert("RGBA")
        data = im.convert("RGBA").tostring("raw", "RGBA")
        qim = QtGui.QImage(data, im.size[0], im.size[1], QtGui.QImage.Format_ARGB32)
        pixmap = QtGui.QPixmap.fromImage(qim)
        return pixmap
    def open(self):
        fileName = (QtGui.QFileDialog.getOpenFileName(self, "Open File", QtCore.QDir.currentPath()))
        if fileName:
            imgPil = Image.open(str(fileName))
            # do your work then convert
            self.imageLabel.setPixmap(self.pil2pixmap(imgPil))

Answer 2

在PyQt5和Python 3.8中，这不再起作用。我将如下编写pil2pixmap函数。

import io
from PyQt5.QtGui import QImage, QPixmap
from PIL import Image


def pil2pixmap(image):
    bytes_img = io.BytesIO()
    image.save(bytes_img, format='JPEG')

    qimg = QImage()
    qimg.loadFromData(bytes_img.getvalue())

    return QPixmap.fromImage(qimg)

其中参数image例如是image = Image.open('path_to_a_picture')

注意：要使用QGuiApplication必须运行的功能

枕头（PIL）到QImage的转换 - ＆gt; python.exe已停止工作

2 个答案: