此前写了个使用cwebp、gif2webp的脚本,但是由于cwebp目前在win的元数据提取存在问题,因此我们可以使用已经支持exif提取和写入的exiftool进行最后一步的转换,这样我们的图片压缩、转码都在官方库得以实现。
前置条件:
cwebp、gif2webp、exiftool三个组件都注册到系统环境变量。python则使用pil库用于分辨率获取。
实现效果:
使用pil库对分辨率进行获取,但是不介入压缩过程,因为cwebp目前没法获取图片分辨率,使用pil库进行是否执行resize的判断。
使用cwebp处理静态png、jpg,使用gif2webp处理gif图,启用mt多线程,压缩质量85,resize到2560最长、宽边,exiftool采用”-overwrite_original”来避免生成两个图片。
测试效果:
该图片原图7M多,压缩质量选择85,可能由于细节较为丰富,压缩到WebP大小仍为1M左右,还是比较大,不过细节保留充分,同时保留了EXIF信息。
import tkinter as tk
from tkinter import filedialog, messagebox
import os
import subprocess
from PIL import Image
def validate_file(input_path):
input_path = os.path.abspath(input_path)
if not os.path.exists(input_path):
raise FileNotFoundError(f"文件 {input_path} 不存在,请检查路径。")
return input_path
def get_resized_dimensions(width, height, max_size):
if width > height:
new_width = max_size
new_height = int((new_width / width) * height)
else:
new_height = max_size
new_width = int((new_height / height) * width)
return new_width, new_height
def convert_image(input_path, output_path, new_width=None, new_height=None):
try:
file_extension = os.path.splitext(input_path)[1].lower()
if file_extension == ".gif":
command = ["gif2webp","mt", input_path, "-o", output_path]
else:
if new_width and new_height:
command = ["cwebp","mt", "-q", "85", "-resize", str(new_width), str(new_height), input_path, "-o", output_path]
else:
command = ["cwebp","mt", "-q", "85", input_path, "-o", output_path]
subprocess.run(command, check=True)
except subprocess.CalledProcessError as e:
raise RuntimeError(f"转换工具运行出错: {e}")
def embed_exif(input_path, output_path):
try:
command = ["exiftool", "-overwrite_original", "-tagsfromfile", input_path, "-all:all", output_path]
subprocess.run(command, check=True)
except subprocess.CalledProcessError as e:
raise RuntimeError(f"EXIF 数据嵌入失败: {e}")
def convert_to_webp(input_path, max_size=2560):
try:
# 验证文件路径
input_path = validate_file(input_path)
output_path = os.path.splitext(input_path)[0] + ".webp"
# 使用 PIL 获取图像分辨率
with Image.open(input_path) as img:
width, height = img.size
if width <= max_size and height <= max_size:
convert_image(input_path, output_path)
else:
new_width, new_height = get_resized_dimensions(width, height, max_size)
convert_image(input_path, output_path, new_width, new_height)
# 嵌入 EXIF 数据
embed_exif(input_path, output_path)
return f"图片已转换并保存为 {output_path}"
except (subprocess.CalledProcessError, FileNotFoundError) as e:
return str(e)
except Exception as e:
return f"处理文件时发生错误: {e}"
def select_files():
file_paths = filedialog.askopenfilenames(
title="选择图片文件",
filetypes=[("*所有图片格式", "*.jpg;*.jpeg;*.png;*.gif"),
("JPEG 图片", "*.jpg;*.jpeg"),
("PNG 图片", "*.png"),
("GIF 图片", "*.gif")]
)
if file_paths:
for path in file_paths:
file_listbox.insert(tk.END, path)
def convert_and_save_batch():
files = file_listbox.get(0, tk.END)
if not files:
messagebox.showerror("错误", "请选择至少一个图片文件!")
return
results = [convert_to_webp(file_path) for file_path in files]
messagebox.showinfo("完成", "\n".join(results))
def clear_list():
file_listbox.delete(0, tk.END)
root = tk.Tk()
root.title("批量图片转换为 WebP 工具")
root.geometry("600x400")
frame = tk.Frame(root)
frame.pack(pady=10, padx=10, fill=tk.BOTH, expand=True)
scrollbar = tk.Scrollbar(frame, orient=tk.VERTICAL)
file_listbox = tk.Listbox(frame, selectmode=tk.EXTENDED, yscrollcommand=scrollbar.set)
scrollbar.config(command=file_listbox.yview)
scrollbar.pack(side=tk.RIGHT, fill=tk.Y)
file_listbox.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
button_frame = tk.Frame(root)
button_frame.pack(pady=10)
select_button = tk.Button(button_frame, text="选择文件", command=select_files, width=15)
select_button.grid(row=0, column=0, padx=5)
clear_button = tk.Button(button_frame, text="清空列表", command=clear_list, width=15)
clear_button.grid(row=0, column=1, padx=5)
convert_button = tk.Button(button_frame, text="批量转换", command=convert_and_save_batch, width=15)
convert_button.grid(row=0, column=2, padx=5)
root.mainloop()