Question

目前，我有一个图像（numpy），我想在QLabel中用颜色绘制它。

可以找到类似的演示：https://matplotlib.org/users/image_tutorial.html。 matplotlib可以使用imshow和colormap显示图像。

现在，我可以在QLabel中显示灰色图像，但我不知道如何将其显示为伪色。

用于显示灰色图像的代码是（self.img就是我所拥有的）：

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import numpy as np
import qimage2ndarray
class MyLabel(QLabel):
    def __init__(self):
        super(MyLabel, self).__init__()
        img = np.zeros((256,256))
        img[0:128,0:128] = 255
        self.img = img

    def paintEvent(self, QPaintEvent):
        super(MyLabel, self).paintEvent(QPaintEvent)

        QImg = qimage2ndarray.gray2qimage(self.img)

        pos = QPoint(0, 0)
        source = QRect(0, 0, 256,256)

        painter = QPainter(self)
        painter.drawPixmap(pos, QPixmap.fromImage(QImg), source)

class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()
        layout = QHBoxLayout(self)
        self.label = MyLabel()
        layout.addWidget(self.label)


if __name__ == '__main__':

    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

Answer 1

我有一个在伪图像中显示灰色图像的解决方案。

首先，我使用opencv生成伪图像：

disImg = cv2.applyColorMap(img, cv2.COLORMAP_AUTUMN)

然后，将图像转换为QImage：

QImg = QImage(disImg.data, disImg.shape[1], disImg.shape[0], disImg.strides[0], QImage.Format_RGB888)

最后，我们可以通过drawpixmap在QLabel中显示它，整个代码应该是：

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import numpy as np
import qimage2ndarray
import matplotlib.pyplot as plt
import cv2
class MyLabel(QLabel):
    def __init__(self):
        super(MyLabel, self).__init__()
        img = np.zeros((256,256),dtype=np.uint8)
        img[0:128,0:128] = 255
        img[128:255,128:255] = 128
        disImg = cv2.applyColorMap(img, cv2.COLORMAP_AUTUMN)
        QImg = QImage(disImg.data, disImg.shape[1], disImg.shape[0], disImg.strides[0], QImage.Format_RGB888)
        self.qimg = QImg

        cv2.imshow('test',disImg)
        cv2.waitKey()

    def paintEvent(self, QPaintEvent):
        super(MyLabel, self).paintEvent(QPaintEvent)

        pos = QPoint(0, 0)
        source = QRect(0, 0, 256,256)

        painter = QPainter(self)
        painter.drawPixmap(pos, QPixmap.fromImage(self.qimg), source)

class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()
        layout = QHBoxLayout(self)
        self.resize(300,300)
        self.label = MyLabel()
        layout.addWidget(self.label)


if __name__ == '__main__':

    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

QT将灰色图像绘制成伪色（PyQt）

1 个答案: