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PDF转高清图片

PDF转高清图片
打开记事本,下文复制代码,粘贴,另存为,文件名—PDF 转图片.html,保存类型—所有文件,保存。适用于包含文本或高清图片的PDF,打开后效果如下:
<!DOCTYPE html><htmllang="zh-CN"><head>    <metacharset="UTF-8">    <metaname="viewport"content="width=device-width, initial-scale=1.0">    <title>PDF转图片 - 300 PPI</title>    <!-- 引入 PDF.js 核心库和渲染器 -->    <scriptsrc="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.16.105/pdf.min.js"></script>    <scriptsrc="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.16.105/pdf.worker.min.js"></script>    <style>        body { font-family: Arial, sans-serif; margin20pxbackground#f0f0f0; }        .container { max-width1200pxmargin0 auto; background: white; padding20pxborder-radius8pxbox-shadow0 2px 10px rgba(0,0,0,0.1); }        inputbutton { padding8px 16pxmargin10px 5pxfont-size14px; }        .preview-area { margin-top20pxdisplay: flex; flex-wrap: wrap; gap20pxjustify-content: flex-start; }        .page-container { border1px solid #cccbackground#fffbox-shadow0 2px 5px rgba(0,0,0,0.1); }        .page-container img { display: block; max-width100%height: auto; }        .page-container p { margin5pxtext-align: center; font-size12pxbackground#eee; }        .info { margin-top15pxpadding10pxbackground#e9ecefborder-radius4pxfont-size14px; }        .error { color: red; }    </style></head><body><divclass="container">    <h2>📄 PDF 转图片(300 PPI 渲染)</h2>    <inputtype="file"id="pdfInput"accept="application/pdf" />    <buttonid="convertBtn">开始转换(300 PPI)</button>    <divclass="info">        ⚡ 说明:基于 PDF.js 渲染,<strong>300 PPI</strong> 表示每英寸 300 像素,根据 PDF 页面尺寸(英寸 = 点/72)自动计算图片宽高。<br>        ✅ 生成的图片为 PNG 格式,可直接右键保存。    </div>    <divid="preview"class="preview-area"></div>    <divid="status"class="info"style="display:none;"></div></div><script>    // 设置 PDF.js worker    pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.16.105/pdf.worker.min.js';    // 辅助函数:将 PDF 页面渲染为图片(指定 PPI)    async function renderPageToImage(page, ppi = 300) {        // 获取页面原始尺寸(单位:点,1 点 = 1/72 英寸)        const viewportOriginal = page.getViewport({ scale1.0 });        const widthInPoints = viewportOriginal.width;   // 宽度(点)        const heightInPoints = viewportOriginal.height// 高度(点)        // 计算英寸:点 / 72 = 英寸        const widthInInches = widthInPoints / 72;        const heightInInches = heightInPoints / 72;        // 根据目标 PPI 计算所需像素尺寸        const widthInPixels = Math.round(widthInInches * ppi);        const heightInPixels = Math.round(heightInInches * ppi);        // 计算缩放比例:目标像素宽度 / 原始点宽度        const scale = widthInPixels / widthInPoints;        // 获取按比例缩放后的视口        const viewport = page.getViewport({ scale: scale });        // 创建 canvas 元素        const canvas = document.createElement('canvas');        const context = canvas.getContext('2d');        canvas.width = viewport.width;        canvas.height = viewport.height;        // 渲染 PDF 页面到 canvas        const renderContext = {            canvasContext: context,            viewport: viewport,            background'white'  // 白色背景        };        await page.render(renderContext).promise;        // 将 canvas 转换为图片数据 URL(PNG 格式)        const imageDataURL = canvas.toDataURL('image/png');        return {            imageUrl: imageDataURL,            width: canvas.width,            height: canvas.height,            ppi: ppi,            sizeInches: { width: widthInInches.toFixed(2), height: heightInInches.toFixed(2) }        };    }    // 主函数:加载 PDF 并转换所有页面    async function convertPDFToImages(file, targetPPI = 300) {        const statusDiv = document.getElementById('status');        const previewDiv = document.getElementById('preview');        statusDiv.style.display = 'block';        statusDiv.innerHTML = '📖 正在加载 PDF 文件...';        previewDiv.innerHTML = ''// 清空之前的内容        try {            // 读取文件为 ArrayBuffer            const arrayBuffer = await file.arrayBuffer();            // 加载 PDF 文档            const loadingTask = pdfjsLib.getDocument({ data: arrayBuffer });            const pdfDocument = await loadingTask.promise;            const totalPages = pdfDocument.numPages;            statusDiv.innerHTML = `📄 PDF 共 ${totalPages} 页,正在以 ${targetPPI} PPI 渲染...`;            // 循环处理每一页            for (let pageNum = 1; pageNum <= totalPages; pageNum++) {                statusDiv.innerHTML = `🎨 正在渲染第 ${pageNum} / ${totalPages} 页...`;                // 获取页面                const page = await pdfDocument.getPage(pageNum);                // 渲染为图片                const result = await renderPageToImage(page, targetPPI);                // 创建页面容器                const pageContainer = document.createElement('div');                pageContainer.className = 'page-container';                pageContainer.style.marginBottom = '20px';                // 创建图片元素                const img = document.createElement('img');                img.src = result.imageUrl;                img.alt = `第 ${pageNum} 页`;                img.style.maxWidth = '100%';                img.style.height = 'auto';                img.style.border = '1px solid #ddd';                // 添加信息文字                const info = document.createElement('p');                info.textContent = `第 ${pageNum} 页 | ${result.width} x ${result.height} 像素 | ${result.ppi} PPI | 实际尺寸: ${result.sizeInches.width}" x ${result.sizeInches.height}"`;                pageContainer.appendChild(img);                pageContainer.appendChild(info);                previewDiv.appendChild(pageContainer);            }            statusDiv.innerHTML = `✅ 转换完成!共 ${totalPages} 页,图片分辨率基于 ${targetPPI} PPI 生成。右键点击图片可保存。`;        } catch (error) {            console.error('转换出错:', error);            statusDiv.innerHTML = `<span class="error">❌ 转换失败: ${error.message}</span>`;        }    }    // 绑定按钮事件    document.getElementById('convertBtn').addEventListener('click'() => {        const fileInput = document.getElementById('pdfInput');        const file = fileInput.files[0];        if (!file) {            alert('请先选择一个 PDF 文件');            return;        }        // 固定使用 300 PPI        convertPDFToImages(file, 300);    });</script></body></html>
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  1. 请求信息 : 2026-04-24 23:59:17 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/552117.html
  2. 运行时间 : 0.083185s [ 吞吐率:12.02req/s ] 内存消耗:4,826.03kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=d61dff4473f14880b36a22ac3632b610
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  1. CONNECT:[ UseTime:0.000580s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000803s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000313s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000262s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000502s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000574s ]
  8. SELECT * FROM `article` WHERE `id` = 552117 LIMIT 1 [ RunTime:0.000411s ]
  9. UPDATE `article` SET `lasttime` = 1777046357 WHERE `id` = 552117 [ RunTime:0.000772s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000215s ]
  11. SELECT * FROM `article` WHERE `id` < 552117 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000429s ]
  12. SELECT * FROM `article` WHERE `id` > 552117 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000338s ]
  13. SELECT * FROM `article` WHERE `id` < 552117 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000709s ]
  14. SELECT * FROM `article` WHERE `id` < 552117 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000700s ]
  15. SELECT * FROM `article` WHERE `id` < 552117 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000894s ]
0.087125s