class Example(QtGui.QWidget):
    def __init__(self):
        super(Example, self).__init__()
        self.initUI()
    def initUI(self):
        self.im = QtGui.QImage("image.jpg")
        self.w = self.im.width()
        self.h = self.im.height()
        self.setWindowTitle('Pixel Color')
        self.show()

#!/usr/bin/env python3
 
# выводит цвета выбранного пикселя изображения
 
import sys
from PyQt4 import QtGui
 
 
class Example(QtGui.QWidget):
 
    def __init__(self):
        super(Example, self).__init__()
 
        self.initUI()
 
    def initUI(self):
 
        self.img = QtGui.QImage('pic.png')
        self.lab = QtGui.QLabel(self)
 
        self.xEdit = QtGui.QLineEdit(self)
        self.xEdit.setText('0')
        self.yEdit = QtGui.QLineEdit(self)
        self.yEdit.setText('0')
 
        pxlButton = QtGui.QPushButton('Get', self)
        pxlButton.resize(pxlButton.sizeHint())
        pxlButton.clicked.connect(self.getPixel)
 
        grid = QtGui.QGridLayout()
        grid.addWidget(self.xEdit, 0, 0)
        grid.addWidget(self.yEdit, 0, 1)
        grid.addWidget(pxlButton, 1, 0)
        grid.addWidget(self.lab, 2, 0, 2, 2)
 
        self.setLayout(grid)
 
        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('Image Pixel')
        self.show()
 
    def getPixel(self):
 
        x = int(self.xEdit.text() or 0)
        y = int(self.yEdit.text() or 0)
 
        if not (0 <= x <= self.img.width() and
                0 <= y <= self.img.height()):
            self.lab.setText('Error')
            return
 
        rgba = self.img.pixel(x, y)
        color = QtGui.QColor(rgba)
 
        text = 'Red: {} Green: {} Blue: {}'.format(
            color.red(), color.green(), color.blue())
 
        self.lab.setText(text)
 
 
def main():
 
    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())
 
 
if __name__ == '__main__':
    main()