图片转 PDF

复制from PIL import Image
import sys

# 将多张图片合并为一个 PDF
images = []
for path in ["page1.jpg", "page2.png", "page3.webp"]:
    try:
        img = Image.open(path).convert("RGB")  # PDF 需要 RGB 模式
        images.append(img)
    except FileNotFoundError:
        print(f"文件未找到: {path}", file=sys.stderr)
        sys.exit(1)

if images:
    # 第一张图作为 PDF 基础，其余追加
    images[0].save("output.pdf", save_all=True, append_images=images[1:])
    print("已生成 output.pdf")
else:
    print("没有有效的图片", file=sys.stderr)

复制package main

import (
	"image"
	"image/jpeg"
	"image/png"
	"os"
	"strings"

	"github.com/signintech/gopdf"
)

func main() {
	pdf := &gopdf.GoPdf{}
	pdf.Start(gopdf.Config{PageSize: *gopdf.PageSizeA4})

	files := []string{"img1.jpg", "img2.png"}
	for _, f := range files {
		img, err := loadImage(f)
		if err != nil {
			panic(err)
		}
		pdf.AddPage()
		pdf.Image(f, 0, 0, &gopdf.Rect{W: float64(img.Bounds().Dx()), H: float64(img.Bounds().Dy())})
	}
	pdf.WritePdf("output.pdf")
}

func loadImage(path string) (image.Image, error) {
	f, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer f.Close()

	if strings.HasSuffix(path, ".png") {
		return png.Decode(f)
	}
	return jpeg.Decode(f)
}

复制const PDFDocument = require('pdfkit');
const fs = require('fs');
const sharp = require('sharp');

async function imagesToPdf(imagePaths, outputPath) {
  const doc = new PDFDocument({ autoFirstPage: false });
  const stream = fs.createWriteStream(outputPath);
  doc.pipe(stream);

  for (const path of imagePaths) {
    // 用 sharp 获取图片尺寸，避免 PDF 页面大小不匹配
    const metadata = await sharp(path).metadata();
    doc.addPage({ size: [metadata.width, metadata.height] });
    doc.image(path, 0, 0, { width: metadata.width, height: metadata.height });
  }

  doc.end();
  return new Promise((resolve, reject) => {
    stream.on('finish', resolve);
    stream.on('error', reject);
  });
}

// 使用示例
imagesToPdf(['photo1.jpg', 'photo2.png'], 'combined.pdf')
  .then(() => console.log('PDF 已生成'))
  .catch(console.error);