dvcrn Image to PDF
Combine multiple image screenshots (typically exam paper questions) into a well-formatted, paginated A4 PDF that is ready for printing.
When to Use
Trigger this skill when the user wants to:
- Combine / merge / stitch images into a PDF
- Put screenshots together into a printable document
- Create a PDF from exam paper photos or screenshots
- Pack question images onto A4 pages for printing
Look for phrases like: "拼到一起", "合成PDF", "拼接", "打印", "combine images", "merge into PDF", etc.
How to Use
This skill includes a Python script at scripts/combine.py (relative to this SKILL.md).
Step 1: Identify inputs and output
From the user's request, extract:
- Input: a directory path or list of image file paths
- Output: the desired PDF output path (default:
output.pdfin the input directory)
Step 2: Run the script
Use uv run to handle dependencies automatically (no manual install needed):
uv run --with Pillow --with numpy python3 <path-to-this-skill>/scripts/combine.py <input> -o <output.pdf>
Input formats:
- A directory:
python scripts/combine.py ./my_images/ -o result.pdf - Multiple files:
python scripts/combine.py img1.png img2.png -o result.pdf
Optional flags:
--margin <px>: page margin in pixels at 300dpi (default: 80, ~7mm)--no-trim: disable automatic whitespace border trimming--dpi <n>: output DPI (default: 300)
Step 4: Report result
Tell the user:
- How many images were processed
- How many PDF pages were generated
- The output file path
What the Script Does
- Loads images, auto-trims whitespace borders
- Scales all images to the same width (A4 printable width)
- Greedily packs images onto A4 pages (tight layout, no gaps)
- When a page break is needed, uses pixel analysis to find whitespace rows so text is never cut
- Outputs a 300 DPI PDF ready for printing