如何使用Python中的PyPDF4模块将pdf转化为png图片？

可以使用以下代码使用PyPDF4模块将pdf转换为png图片：

import os
from PIL import Image
import PyPDF4

def pdf_to_png(input_path, output_path):
    with open(input_path, 'rb') as pdf_file:
        pdf_reader = PyPDF4.PdfFileReader(pdf_file)
        total_pages = pdf_reader.getNumPages()

        for page_number in range(total_pages):
            page = pdf_reader.getPage(page_number)
            page_data = page['/Resources']['/XObject'].getObject()

            for obj in page_data:
                if page_data[obj]['/Subtype'] == '/Image':
                    size = (page_data[obj]['/Width'], page_data[obj]['/Height'])
                    data = page_data[obj].getData()
                    mode = ''
                    if page_data[obj]['/ColorSpace'] == '/DeviceRGB':
                        mode = 'RGB'
                    else:
                        mode = 'P'

                    if '/Filter' in page_data[obj]:
                        if page_data[obj]['/Filter'] == '/FlateDecode':
                            img = Image.frombytes(mode, size, data)
                            img.save(os.path.join(output_path, f'page{page_number+1}_{obj[1:]}.png'))
                        elif page_data[obj]['/Filter'] == '/DCTDecode':
                            img = open(os.path.join(output_path, f'page{page_number+1}_{obj[1:]}.jpg'), 'wb')
                            img.write(data)
                            img.close()
                        elif page_data[obj]['/Filter'] == '/JPXDecode':
                            img = open(os.path.join(output_path, f'page{page_number+1}_{obj[1:]}.jp2'), 'wb')
                            img.write(data)
                            img.close()
                        elif page_data[obj]['/Filter'] == '/CCITTFaxDecode':
                            img = open(os.path.join(output_path, f'page{page_number+1}_{obj[1:]}.tiff'), 'wb')
                            img.write(data)
                            img.close()

pdf_to_png('input.pdf', 'output/')

在这里，我们首先打开pdf文件并获取其页面数。然后，我们使用循环从每个页面中提取图像并将其保存为png文件。如果图像是其他格式（如JPEG，JP2或TIFF），则会将其保存为相应的格式。请注意，我们使用了Pillow库来处理图像。请确保安装了该库。