python实现将图片批量转换为jpg格式

需要用Python写个脚本，将图片批量转换为jpg格式，顺便做成一个小软件发布出来。
本文python运行环境：windows
首先，需要引入安装pillow模块

>>pip install pillow

如果安装不成功,请使用管理员权限安装。

直接跑脚本的话，代码如下：

#!/usr/bin/python
# -*- coding:UTF-8 -*-

from PIL import Image
import os
import sys

if __name__ == '__main__':
    if os.path.isfile(sys.argv[1]):
        try:
            image = Image.open(sys.argv[1])
            image.save(os.path.splitext(sys.argv[1])[0] + ".jpg", quality=100)
            print("image to jpg sucess: " + sys.argv[1])
        except:
            print("image to jpg fail: " + sys.argv[1])
    else:
        if os.path.exists(sys.argv[2]) == False:
            os.makedirs(sys.argv[2])
        for file in os.listdir(sys.argv[1]):
            src = os.path.join(sys.argv[1], file)
            print(src)
            try:
                image = Image.open(src)
                dest = sys.argv[2] + "/" + os.path.splitext(file)[0] + ".jpg"
                image.save(dest, quality=100)
                print("image to jpg sucess: " + file)
            except:
                print("image to jpg fail: " + file)

引入PyQt5，开发图形界面。代码如下：

#!/usr/bin/python3
# -*- coding: utf-8 -*-

from PyQt5 import QtWidgets, QtCore, QtGui

from PyQt5.QtWidgets import (QApplication, QWidget, QPushButton, QTextEdit,
                            QHBoxLayout, QLineEdit, QGroupBox, QFormLayout,
                            QSlider, QLabel, QFileDialog, QMessageBox)
from PyQt5.QtCore import Qt
from PIL import Image
import os
import sys

class image2jpgWindow(QWidget):

    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        self.setWindowTitle('image2jpg')
        self.resize(600, 150)

        srcFoldChooser = QHBoxLayout()
        self.srcFoldName = QLineEdit()
        self.srcFoldName.setFocusPolicy(Qt.NoFocus)
        self.srcFoldBtn = QPushButton('打开')
        self.srcFoldBtn.clicked.connect(self.chooseSrcFolder)
        srcFoldChooser.addWidget(self.srcFoldName)
        srcFoldChooser.addWidget(self.srcFoldBtn)

        desFoldChooser = QHBoxLayout()
        self.desFoldName = QLineEdit()
        self.desFoldName.setFocusPolicy(Qt.NoFocus)
        self.desFoldBtn = QPushButton('另存为')
        self.desFoldBtn.clicked.connect(self.chooseDesFolder)
        desFoldChooser.addWidget(self.desFoldName)
        desFoldChooser.addWidget(self.desFoldBtn)

        confirmBox = QHBoxLayout()
        self.qualitySlider = QSlider(Qt.Horizontal)
        self.qualitySlider.setMaximum(100)
        self.qualitySlider.setMinimum(20)
        self.qualitySlider.setSingleStep(10)
        #self.qualitySlider.setTickPosition(QSlider.TicksBelow)
        self.qualitySlider.setTickInterval(10)
        self.qualitySlider.setValue(100)
        self.qualitySlider.valueChanged.connect(self.valChange)
        self.qualityLabel1 = QLabel('图片质量:')
        self.qualityLabel2 = QLabel('100')
        self.qualityLabel3 = QLabel('%')
        self.confirmBtn = QPushButton('开始转换')
        self.confirmBtn.clicked.connect(self.startExchange)
        confirmBox.addWidget(self.qualityLabel1)
        confirmBox.addWidget(self.qualitySlider)
        confirmBox.addWidget(self.qualityLabel2)
        confirmBox.addWidget(self.qualityLabel3)
        confirmBox.addWidget(self.confirmBtn)

        srcFoldGroup = QGroupBox('')
        srcFoldGroup.setLayout(srcFoldChooser)
        desFoldGroup = QGroupBox('')
        desFoldGroup.setLayout(desFoldChooser)
        confirmGroup = QGroupBox('')
        confirmGroup.setLayout(confirmBox)
        layout = QFormLayout()
        layout.addWidget(srcFoldGroup)
        layout.addWidget(desFoldGroup)
        layout.addWidget(confirmGroup)
        self.setLayout(layout)
        #btn = QPushButton('Hello')
        #btn = QPushButton('Hello', self)
        #textEdit = QTextEdit(self)
        self.show()
    
    def valChange(self):
        self.qualityLabel2.setNum(self.qualitySlider.value())
    
    def chooseSrcFolder(self):
        #选择要转换图片的文件夹
        srcDirectoy = QFileDialog.getExistingDirectory(self, '打开要转换图片的文件夹', "./")
        #srcDirectoy = srcDirectoy.replace('/', '\\')
        self.srcFoldName.setText(srcDirectoy)

    def chooseDesFolder(self):
        #选择目标文件夹
        desDirectoy = QFileDialog.getExistingDirectory(self, '打开目标文件夹', "./")
        #desDirectoy = desDirectoy.replace('/', '\\')
        self.desFoldName.setText(desDirectoy)
    
    def startExchange(self):
        if self.srcFoldName.text() == "":
            QMessageBox.critical(self, 'image2jpg', '源文件夹为空！', QMessageBox.Yes, QMessageBox.Yes)
            return
        if not os.path.exists(self.srcFoldName.text()):
            QMessageBox.critical(self, 'image2jpg', '源文件夹不存在或路径非法！', QMessageBox.Yes, QMessageBox.Yes)
            return
        if self.desFoldName.text() == "":
            QMessageBox.critical(self, 'image2jpg', '目标文件夹为空！', QMessageBox.Yes, QMessageBox.Yes)
            return
        elif not os.path.exists(self.srcFoldName.text()):
            QMessageBox.critical(self, 'image2jpg', '目标文件夹不存在或路径非法！', QMessageBox.Yes, QMessageBox.Yes)
            return

        for file in os.listdir(self.srcFoldName.text()):
            #src = os.path.join(self.srcFoldName.text(), file)
            src = os.path.join(self.srcFoldName.text(), file)
            print(self.srcFoldName.text())
            print(src)
            try:
                image = Image.open(src)
                dest = self.desFoldName.text() + "/" + os.path.splitext(file)[0] + ".jpg"
                print(dest)
                image.save(dest, quality=self.qualitySlider.value())
                print("image to jpg sucess: " + file)
            except:
                print("image to jpg fail: " + file)
                reply = QMessageBox.question(self,'image2jpg', '文件' + file + '转换出错，请问继续吗？', QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
                if reply == QMessageBox.No:
                    print("yes")
                else:
                    return

if __name__ == '__main__':

    app = QApplication(sys.argv)
    mainWindow = image2jpgWindow()
    sys.exit(app.exec_())