poster-a0-no-margin-export

name: poster-a0-no-margin-export description: Export A0 poster PDFs with zero page margin while preserving WebUI appearance by using screenshot, border-trim, and full-page PDF rendering. Use when users ask "A0 PDF", "余白なし", "webと同じ見た目", or poster HTML print delivery.

Poster A0 No Margin Export

Use this skill to generate print-ready A0 PDF from poster HTML with no outer margin and WebUI-like appearance.

When To Use

• User asks for:
  • "A0 PDF"
  • "余白なしで出力"
  • "WebUIと同じ見た目でPDF化"
  • "poster-preview.html から印刷用PDFを作る"

Inputs

• Default source HTML: poster-gen/poster-preview.html
• Default preview PNG: poster-gen/poster-preview-output.png
• Default trimmed PNG: poster-gen/poster-preview-output-bleed.png
• Default output PDF: poster-gen/SIT_Copilot_Poster.pdf
• Default PDF title: SIT_Copilot_Poster

Workflow

1. Render poster HTML to PNG using Playwright screenshot (--viewport-size 3400,4804).
2. Trim uniform outer border from PNG (background color sampled from top-left pixel).
3. Compose temporary A0 HTML (@page margin 0) with trimmed PNG stretched to full page.
4. Export single-page A0 PDF via Playwright PDF.
5. Verify PDF (Pages: 1, Page size: A0) with pdfinfo.

Command

bash .codex/skills/poster-a0-no-margin-export/scripts/export_a0_no_margin.sh \
  --repo-root /home/argo/sit-copilot \
  --html poster-gen/poster-preview.html \
  --pdf poster-gen/SIT_Copilot_Poster.pdf \
  --title SIT_Copilot_Poster

Script Parameters

• --repo-root: repository root (default: current git root)
• --html: source HTML path (relative to repo root or absolute)
• --png: screenshot output path
• --trimmed-png: trimmed output path
• --pdf: output PDF path
• --title: PDF metadata title
• --viewport: screenshot viewport (W,H)
• --wait-ms: screenshot wait time (ms)
• --trim-threshold: RGB distance threshold for border detection
• --trim-coverage: row/column coverage ratio for content detection
• --trim-inset: inward crop pixels after detection

Guardrails

• Keep poster claims/metrics unchanged unless explicitly requested.
• Do not add URL text to print output when QR-only policy is requested.
• Prefer HTML edits in source file; avoid manual PPTX edits unless unavoidable.

Output Contract

• Produce:
  • poster-gen/poster-preview-output.png
  • poster-gen/poster-preview-output-bleed.png
  • target A0 PDF path
• Report:
  • PDF path
  • pdfinfo summary lines (Title, Pages, Page size)

Files

• scripts/export_a0_no_margin.sh
• scripts/trim_uniform_border.py