用Python把一张PNG切成小图再拼回去，具体怎么操作？

分割和合并PNG图片可以通过Python的`Pillow`库来实现。以下是具体的代码示例： ### 分割PNG图片 ```python from PIL import Image def split_image(image_path, rows, cols): img = Image.open(image_path) width, height = img.size part_width = width // cols part_height = height // rows for i in range(rows): for j in range(cols): left = j * part_width upper = i * part_height right = left + part_width lower = upper + part_height part = img.crop((left, upper, right, lower)) part.save(f'part_{i}_{j}.png') # 使用示例 split_image('your_image.png', 2, 2) ``` ### 合并PNG图片 ```python from PIL import Image def join_images(image_paths, rows, cols): images = [Image.open(img_path) for img_path in image_paths] part_width, part_height = images[0].size new_width = part_width * cols new_height = part_height * rows new_img = Image.new('RGB', (new_width, new_height)) index = 0 for i in range(rows): for j in range(cols): new_img.paste(images[index], (j * part_width, i * part_height)) index += 1 new_img.save('joined_image.png') # 使用示例 image_paths = ['part_0_0.png', 'part_0_1.png', 'part_1_0.png', 'part_1_1.png'] join_images(image_paths, 2, 2) ```

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