前言

  通过这段代码可以修改图片的像素尺寸大小
运行截图如下

代码如下：

import tkinter as tk
from tkinter import filedialog, messagebox, colorchooser
from PIL import Image, ImageDraw


class ImageProcessorApp:
    def __init__(self, root):
        self.root = root
        self.root.title("图片处理程序")

        # 添加选择文件按钮
        self.select_file_button = tk.Button(self.root, text="选择图片文件", command=self.select_file)
        self.select_file_button.pack(pady=10)

        # 添加尺寸选择按钮
        self.select_size_button = tk.Button(self.root, text="选择尺寸", command=self.select_size)
        self.select_size_button.pack(pady=10)

        # 添加处理图片按钮
        self.process_button = tk.Button(self.root, text="处理图片", command=self.process_image)
        self.process_button.pack(pady=20)

        # 初始化变量
        self.input_path = None
        self.output_path = None
        self.new_size = None

    def select_file(self):
        self.input_path = filedialog.askopenfilename(filetypes=[("Image Files", "*.jpg;*.png;*.jpeg")])
        if self.input_path:
            messagebox.showinfo("文件选择", f"选择的文件：{self.input_path}")

    def select_size(self):
        size_dialog = tk.Toplevel(self.root)
        size_dialog.title("选择尺寸")

        label = tk.Label(size_dialog, text="输入新尺寸（宽 x 高）：")
        label.pack(padx=10, pady=10)

        self.width_entry = tk.Entry(size_dialog)
        self.width_entry.pack(padx=10, pady=5)

        self.height_entry = tk.Entry(size_dialog)
        self.height_entry.pack(padx=10, pady=5)

        confirm_button = tk.Button(size_dialog, text="确认", command=self.set_size)
        confirm_button.pack(pady=10)

    def set_size(self):
        try:
            width = int(self.width_entry.get())
            height = int(self.height_entry.get())
            self.new_size = (width, height)
            messagebox.showinfo("尺寸选择", f"选择的尺寸：{self.new_size}")
        except ValueError:
            messagebox.showerror("错误", "请输入有效的整数尺寸！")
    def process_image(self):
        if not self.input_path:
            messagebox.showerror("错误", "请先选择图片文件！")
            return
        if not self.new_size:
            messagebox.showerror("错误", "请先选择新尺寸！")
            return

        output_path = filedialog.asksaveasfilename(defaultextension=".jpg",
                                                   filetypes=[("JPEG", "*.jpg"), ("PNG", "*.png")])
        if output_path:
            try:
                original_image = Image.open(self.input_path)
                new_image = original_image.resize(self.new_size)
                if new_image.mode != 'RGB':
                    new_image = new_image.convert('RGB')
                final_image = Image.new("RGB", self.new_size, self.background_color)
                final_image.paste(new_image, (0, 0))
                final_image.save(output_path)
                messagebox.showinfo("完成", f"处理后的图片已保存为：{output_path}")
            except Exception as e:
                messagebox.showerror("错误", f"处理图片时出错：{e}")


if __name__ == "__main__":
    root = tk.Tk()
    app = ImageProcessorApp(root)
    root.mainloop()