将文件夹中的图片按顺序两两合并为A3横向PDF（两张A4左右并排）。触发词：合并PDF、合成A3、两张A4合成一页、图片转PDF。
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Install skill "a4-to-a3-pdf" with this command: npx skills add wangchuang9523-gif/a4-to-a3-pdf
将多张图片合并为 A3 横向 PDF，每页放置两张图片（左右并排）。
python scripts/merge_a4_to_a3.py <图片文件夹> <输出PDF路径> [dpi]
示例：
python scripts/merge_a4_to_a3.py "C:\Users\ZERO\Desktop\质保书" "C:\Users\ZERO\Desktop\输出.pdf"
如需自定义（如添加白边、调整尺寸），参考脚本逻辑自行修改。
python -c "from PIL import Image" 或 python -m pip install PillowThis detail page is rendered from real SKILL.md content. Trust labels are metadata-based hints, not a safety guarantee.
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