EN:Seal

English | 中文版

Seals (YinZhang / 印章)

The \印章 command adds images like collection marks or personal seals to the page, supporting absolute positioning and opacity.

Usage

\印章[page=1, xshift=2cm, yshift=5cm, opacity=0.8, width=3cm]{seal.png}

Parameters

• page: Page number where the seal appears (default: 1).
• xshift / yshift: Offsets from the page center or margin.
• opacity: Opacity (0.0 to 1.0). For ancient books, 0.7-0.9 is recommended to simulate ink absorption.
• width: Display width of the seal image.
• color: (Optional) Color for vector-based seals.

Features

• Layer Management: Seals are rendered during the shipout/background hook by default, appearing below the text. This can be customized if foreground placement is needed.
• Multi-point Layout: Multiple seal commands can be used on the same page; they are positioned independently based on their coordinates.
• Absolute Positioning: Uses TikZ's coordinate system for pinpoint accuracy on the page.

Technical Implementation

Seals leverage LaTeX shipout hooks. Each call to \印章 registers a tikzpicture block inside the appropriate hook, wrapped in an \ifnum\value{page}=N conditional to ensure images are output on the correct page and at the correct layer.

---

👉 Next Steps: Check Judou or Features Overview.