part 1

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QRadioButton, QLabel, QLineEdit
from PyQt5.QtGui import QPixmap
from PIL import Image

class Picture(QWidget):
    def __init__(self):
        super().__init__()
        self.current = "first.jpg"
        self.initUI()


    def initUI(self):
        self.setGeometry(300, 300, 300, 300)
        self.setWindowTitle('Редактор изображений')


        self.pixmap = QPixmap(self.current)
        self.image_label = QLabel(self)
        self.image_label.move(80, 60)
        self.image_label.resize(250, 250)
        self.image_label.setPixmap(self.pixmap)


        self.channel = [QPushButton(self) for i in range(4)]
        self.channel[0].setText('R')
        self.channel[1].setText('G')
        self.channel[2].setText('B')
        self.channel[3].setText('Original')
        for i in range(4):
            self.channel[i].move(20, 30 * i)
            self.channel[i].clicked.connect(self.run())

        self.rotate_btn = QPushButton('вправо',self)
        self.rotate_btn.clicked.connect(self.rotate)
        self.rotate_btn.move(230, 320)


        self.rotate_btn = QPushButton('влево',self)
        self.rotate_btn.clicked.connect(self.rotate)
        self.rotate_btn.move(90, 320)


    def run(self):
        im = Image.open("first.jpg")
        pixels = im.load()
        x, y = im.size
        for i in range(x):
            for j in range(y):
                r, g, b = pixels[i, j]
                if(self.sender().text() == 'R'):
                    pixels[i, j] = r, 0, 0
                elif(self.sender().text() == 'G'):
                    pixels[i, j] = 0, g, 0
                elif(self.sender().text() == 'B'):
                    pixels[i, j] = 0, 0, b
                else:
                    pass
        im.save("second.jpg")
        self.pixmap.load("second.jpg")
        self.current = "second.jpg"
        self.image.setPixmap(self.pixmap)
                

    def rotate(self):
      im = Image.open(self.current)
      if(self.sender().text() == "вправо"):
          degree = -90
      else:
          degree = 90
      im2 = im.rotate(degree, expand = True)
      im2.save("second.jpg")
      self.pixmap.load("second.jpg")
      self.current = "second.jpg"
      self.image.setPixmap(self.pixmap)
      
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Picture()
    ex.show()
    sys.exit(app.exec())