main.py

import os
from PyQt5.QtWidgets import (
   QApplication, QWidget,
   QFileDialog,
   QLabel, QPushButton, QListWidget,
   QHBoxLayout, QVBoxLayout
)
from PyQt5.QtCore import Qt # нужна константа Qt.KeepAspectRatio для изменения размеров с сохранением пропорций
from PyQt5.QtGui import QPixmap # оптимизированная для показа на экране картинка
from PIL import Image
from PIL.ImageQt import ImageQt # для перевода графики из Pillow в Qt 
from PIL import ImageFilter
from PIL.ImageFilter import (
   BLUR, CONTOUR, DETAIL, EDGE_ENHANCE, EDGE_ENHANCE_MORE,
   EMBOSS, FIND_EDGES, SMOOTH, SMOOTH_MORE, SHARPEN,
   GaussianBlur, UnsharpMask
)

app = QApplication([])
win =QWidget()
win.resize(700, 500)
win.setWindowTitle('Easy Editor')
lb_image = QLabel('Картинка')
btn_dir = QPushButton('Папка')
lw_files = QListWidget()

btn_left = QPushButton('Лево')
btn_right = QPushButton("Право")
btn_flip = QPushButton("Зеркало")
btn_sharp = QPushButton("Резкость")
btn_bw = QPushButton("Ч/Б")

row = QHBoxLayout()
col1 = QVBoxLayout()
col2 = QVBoxLayout()
col1.addWidget(btn_dir)
col1.addWidget(lw_files)
col2.addWidget(lb_image, 95)
row_tools = QHBoxLayout()
row_tools.addWidget(btn_left)
row_tools.addWidget(btn_right)
row_tools.addWidget(btn_flip)
row_tools.addWidget(btn_sharp)
row_tools.addWidget(btn_bw)
col2.addLayout(row_tools)

row.addLayout(col1, 20)
row.addLayout(col2, 80)
win.setLayout(row)

win.show()
workdir = ''

def filter(files, extensions):
    result = []
    for filename in files:
        for ext in extensions:
            if filename.endswith(ext):
                result.append(filename)
    return result

def chooseWordir():
    global workdir
    workdir = QFileDialog.getExistingDirectory()


def showFilenamesList():
    extensions = ['.jpg', '.jpeg', '.png', 'gif', ".bmp"]
    chooseWorkdir()
    filenames = filter(os.listdir(workdir), extensions)

    lw_files.clear()
    for filename in filenames:
        lw_files.addItem(filename)


btn_dir.clicked.connect(showFilenamesList)

class ImageProcessor():
    def __init__(self):
        self.image = None
        self.dir = None
        self.filename = None
        self.save_dir = 'Polina/'


    def loadImage(self, filename):
        self.filename = filename
        fullname = os.path.join(workdir,filename)
        self.image = Image.open(fullname)

    def saveImage(self):
        path = os.path.join(workdir, self.save_dir)
        if not(os.path.exists(path) or os.path.isdir(path)):
            os.mkdir(path)
        fullname = os.path.join(path, self.filename)
        self.image.save(fullname)


    def do_bw(self):
        self.image = self.image.convert('L')
        self.saveImage()
        image_path = os.path.join(workdir,
        self.save_dir, self.filename)
        self.showImage(image_path)

    def do_left(self):
        self.image = self.image.transpose(Image.ROTATE_90)
        self.saveImage()
        image_path = os.path.join(workdir,
        self.save_dir, self.filename)
        self.showImage(image_path)

    def do_right(self):
        self.image = self.image.transpose(Image.ROTATE_270)
        self.saveImage()
        image_path = os.path.join(workdir,
        self.save_dir, self.filename)
        self.showImage(image_path)

    def do_flip(self):
        self.image = self.image.transpose(Image.FLIP_LEFT_RIGHT)
        self.saveImage()
        image_path = os.path.join(workdir,
        self.save_dir, self.filename)
        self.showImage(image_path)

    def do_sharpen(self):
        self.image = self.image.filter(SHARPEN)
        self.saveImage()
        image_path = os.path.join(workdir,
        self.save_dir, self.filename)
        self.showImage(image_path)
        
    def showImage(self, path):
        lb_image.hide()
        pixmapimage = QPixmap(path)
        w, h = lb_image.width(), lb_image.height()
        pixmapimage = pixmapimage.scaled(w, h,
        Qt.KeepAspectRatio)
        lb_image.setPixmap(pixmapimage)
        lb_image.show()

def showChosenImage():
    if lw_files.currentRow() >= 0:
        filename = lw_files.currentItem().text()
        workimage.loadImage(filename)
        workimage.showImage(os.path.join(workdir,
        workimage.filename))


workimage = ImageProcessor()
lw_files.currentRowChanged.connect(showChosenImage)

btn_bw.clicked.connect(workimage.do_bw)
btn_left.clicked.connect(workimage.do_left)
btn_right.clicked.connect(workimage.do_right)
btn_sharp.clicked.connect(workimage.do_sharpen)
btn_flip.clicked.connect(workimage.do_flip)

app.exec()