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Create app.py
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app.py
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import os
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import gradio as gr
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from pdf2image import convert_from_path
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from typing import List
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def pdf_to_images(
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pdf_file: str,
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output_format: str = "jpg",
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dpi: int = 200,
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output_dir: str = "output_images"
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) -> List[str]:
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"""
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将PDF转换为图片并保存到指定目录
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:param pdf_file: 上传的PDF文件路径
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:param output_format: 输出格式(jpg/png)
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:param dpi: 分辨率(默认200)
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:param output_dir: 输出目录名
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:return: 生成的图片路径列表
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"""
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# 创建输出目录(如果不存在)
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os.makedirs(output_dir, exist_ok=True)
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# 转换PDF为图片
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images = convert_from_path(pdf_file, dpi=dpi)
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# 保存图片
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saved_paths = []
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for i, image in enumerate(images):
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output_path = os.path.join(output_dir, f"page_{i+1}.{output_format}")
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image.save(output_path, "JPEG" if output_format == "jpg" else "PNG")
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saved_paths.append(output_path)
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return saved_paths
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def process_pdf(
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pdf_file: gr.File,
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output_format: str,
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dpi: int
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) -> gr.Gallery:
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"""
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Gradio处理函数
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"""
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if not pdf_file:
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raise gr.Error("请先上传PDF文件!")
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# 调用转换函数
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image_paths = pdf_to_images(
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pdf_file.name,
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output_format=output_format,
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dpi=dpi
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)
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return image_paths
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# Gradio界面
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with gr.Blocks(title="PDF转图片工具") as demo:
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gr.Markdown("## 📄 PDF转图片工具")
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gr.Markdown("上传PDF文件,选择输出格式和分辨率,点击“转换”按钮。")
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with gr.Row():
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with gr.Column():
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pdf_input = gr.File(label="上传PDF文件", file_types=[".pdf"])
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output_format = gr.Radio(
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choices=["jpg", "png"],
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label="输出格式",
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value="jpg"
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)
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dpi_slider = gr.Slider(
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minimum=100,
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maximum=600,
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step=50,
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value=200,
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label="分辨率 (DPI)"
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)
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convert_btn = gr.Button("转换", variant="primary")
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with gr.Column():
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gallery = gr.Gallery(
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label="生成的图片",
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columns=2,
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height="auto"
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)
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# 绑定事件
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convert_btn.click(
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fn=process_pdf,
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inputs=[pdf_input, output_format, dpi_slider],
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outputs=gallery
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)
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# 启动应用
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if __name__ == "__main__":
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demo.launch()
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