Eric - Easy Editor Part 2

import os

from PyQt5.QtWidgets import(QApplication, QWidget, QFileDialog, QLabel, QPushButton, QListWidget, QHBoxLayout, QVBoxLayout)

from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPixmap
from PIL import Image
from PIL import ImageFilter
from PIL.ImageQt import ImageQt
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("Image")
btn_dir = QPushButton("Folder")
lw_files = QListWidget()

btn_left = QPushButton("Left")
btn_right = QPushButton("Right")
btn_flip = QPushButton("Mirror")
btn_sharp = QPushButton("Sharpness")
btn_bw = QPushButton("B/W")

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)

workdir = ''

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

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

def showFilenameList():
    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(showFilenameList)

class ImageProcessor():
    def __init__(self):
        self.image = None
        self.dir = None
        self.filename = None
        self.save_dir = "Modified/" #object(current image) saved to a filecalled modified

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

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

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

workimage = ImageProcessor()

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

lw_files.currentRowChanged.connect(showChosenImage)

btn_bw.clicked.connect(workimage.do_bw)
btn_left.clicked.connect(workimage.do_left)

win.show()
app.exec()