Python调用PIL库实现图片格式转换工具

import os
import tkinter as tk
from tkinter import ttk, filedialog, messagebox
from pil import image
from pathlib import path
 
supported_formats = ["jpeg", "png", "bmp", "gif", "tiff", "webp"]
 
class imageconverterapp:
    def __init__(self, root):
        self.root = root
        self.root.title("图片格式转换工具")
        self.root.geometry("800x600")
 
        # 初始化变量
        self.selected_files = []
        self.output_format = tk.stringvar(value="jpeg")
        self.output_path = tk.stringvar()
        self.quality = tk.intvar(value=85)
        self.resize_enabled = tk.booleanvar(value=false)
        self.new_width = tk.intvar(value=0)
        self.new_height = tk.intvar(value=0)
        self.keep_ratio = tk.booleanvar(value=true)
        self.keep_metadata = tk.booleanvar(value=false)
 
        self.create_widgets()
 
    def create_widgets(self):
        # 文件选择区域
        file_frame = ttk.labelframe(self.root, text="选择图片")
        file_frame.pack(padx=10, pady=5, fill="x")
 
        ttk.button(file_frame, text="添加文件", command=self.add_files).pack(side="left", padx=5)
        ttk.button(file_frame, text="添加文件夹", command=self.add_folder).pack(side="left", padx=5)
        ttk.button(file_frame, text="清空列表", command=self.clear_files).pack(side="right", padx=5)
 
        # 文件列表
        self.file_list = tk.listbox(self.root, selectmode=tk.extended)
        self.file_list.pack(padx=10, pady=5, fill="both", expand=true)
 
        # 设置区域
        settings_frame = ttk.labelframe(self.root, text="转换设置")
        settings_frame.pack(padx=10, pady=5, fill="x")
 
        # 输出格式
        ttk.label(settings_frame, text="输出格式:").grid(row=0, column=0, sticky="w")
        format_combo = ttk.combobox(settings_frame, textvariable=self.output_format, 
                                  values=supported_formats, state="readonly")
        format_combo.grid(row=0, column=1, padx=5, sticky="ew")
 
        # 输出路径
        ttk.label(settings_frame, text="输出路径:").grid(row=1, column=0, sticky="w")
        ttk.entry(settings_frame, textvariable=self.output_path).grid(row=1, column=1, columnspan=2, padx=5, sticky="ew")
        ttk.button(settings_frame, text="浏览...", command=self.select_output_path).grid(row=1, column=3, padx=5)
 
        # 质量设置
        ttk.label(settings_frame, text="图片质量 (1-100):").grid(row=2, column=0, sticky="w")
        ttk.scale(settings_frame, from_=1, to=100, variable=self.quality, 
                 command=lambda v: self.quality.set(int(float(v)))).grid(row=2, column=1, padx=5, sticky="ew")
        ttk.label(settings_frame, textvariable=self.quality).grid(row=2, column=2, padx=5)
 
        # 尺寸调整
        resize_frame = ttk.frame(settings_frame)
        resize_frame.grid(row=3, column=0, columnspan=3, sticky="ew", pady=5)
        ttk.checkbutton(resize_frame, text="调整尺寸", variable=self.resize_enabled).pack(side="left", padx=5)
        ttk.entry(resize_frame, textvariable=self.new_width, width=5).pack(side="left", padx=5)
        ttk.label(resize_frame, text="x").pack(side="left")
        ttk.entry(resize_frame, textvariable=self.new_height, width=5).pack(side="left", padx=5)
        ttk.checkbutton(resize_frame, text="保持比例", variable=self.keep_ratio).pack(side="left", padx=5)
 
        # 其他选项
        ttk.checkbutton(settings_frame, text="保留元数据", variable=self.keep_metadata).grid(row=4, column=0, columnspan=3, sticky="w")
 
        # 操作按钮
        button_frame = ttk.frame(self.root)
        button_frame.pack(padx=10, pady=10, fill="x")
 
        ttk.button(button_frame, text="开始转换", command=self.start_conversion).pack(side="right", padx=5)
        ttk.button(button_frame, text="退出", command=self.root.destroy).pack(side="right", padx=5)
 
    def add_files(self):
        files = filedialog.askopenfilenames(
            filetypes=[("图片文件", "*.jpg *.jpeg *.png *.bmp *.gif *.tiff *.webp")]
        )
        if files:
            self.selected_files.extend(files)
            self.update_file_list()
 
    def add_folder(self):
        folder = filedialog.askdirectory()
        if folder:
            for ext in ("*.jpg", "*.jpeg", "*.png", "*.bmp", "*.gif", "*.tiff", "*.webp"):
                self.selected_files.extend(path(folder).glob(ext))
            self.update_file_list()
 
    def clear_files(self):
        self.selected_files = []
        self.file_list.delete(0, tk.end)
 
    def update_file_list(self):
        self.file_list.delete(0, tk.end)
        for f in self.selected_files:
            self.file_list.insert(tk.end, str(f))
 
    def select_output_path(self):
        path = filedialog.askdirectory()
        if path:
            self.output_path.set(path)
 
    def start_conversion(self):
        if not self.selected_files:
            messagebox.showwarning("警告", "请先选择要转换的图片文件！")
            return
    
        output_path = self.output_path.get() or os.path.dirname(self.selected_files[0])
        output_format = self.output_format.get()
    
        # 创建输出目录（如果不存在）
        os.makedirs(output_path, exist_ok=true)
    
        for file_path in self.selected_files:
            try:
                img = image.open(file_path)
                
                # 处理尺寸调整
                if self.resize_enabled.get():
                    width = self.new_width.get()
                    height = self.new_height.get()
                    original_width, original_height = img.size
 
                    if self.keep_ratio.get():
                        if width > 0 and height == 0:
                            ratio = width / original_width
                            height = int(original_height * ratio)
                        elif height > 0 and width == 0:
                            ratio = height / original_height
                            width = int(original_width * ratio)
                        else:
                            ratio = min(width/original_width, height/original_height)
                            width = int(original_width * ratio)
                            height = int(original_height * ratio)
                    
                    if width > 0 and height > 0:
                        img = img.resize((width, height), image.resampling.lanczos)
    
                # 构建输出路径
                filename = os.path.splitext(os.path.basename(file_path))[0]
                output_file = os.path.join(output_path, f"{filename}.{output_format.lower()}")
    
                # 检查文件是否存在并提示
                if os.path.exists(output_file):
                    response = messagebox.askyesnocancel(
                        "文件已存在",
                        f"目标文件已存在：\n{output_file}\n\n"
                        "请选择操作：\n"
                        "• 是：覆盖当前文件\n"
                        "• 否：跳过当前文件\n"
                        "• 取消：中止全部转换",
                        parent=self.root
                    )
                    
                    if response is none:  # 取消
                        return
                    if not response:      # 跳过
                        continue
    
                # 构建输出路径
                filename = os.path.splitext(os.path.basename(file_path))[0]
                output_file = os.path.join(output_path, f"{filename}.{output_format.lower()}")
 
                # 保存参数
                save_args = {'format': output_format}
                if output_format == 'jpeg':
                    save_args['quality'] = self.quality.get()
                    save_args['optimize'] = true
                elif output_format == 'png':
                    save_args['compress_level'] = 9 - int(self.quality.get() / 11.1)
 
                # 保存图片
                if not self.keep_metadata.get():
                    img.info.pop('exif', none)
                img.save(output_file, **save_args)
    
            except exception as e:
                messagebox.showerror("错误", f"处理文件 {file_path} 时出错：\n{str(e)}")
                continue
    
        messagebox.showinfo("完成", "图片转换完成！")
 
if __name__ == "__main__":
    root = tk.tk()
    app = imageconverterapp(root)
    root.mainloop()