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korap.ids-mannheim.de / IDS-Mannheim / posterdown / a487fb74ce4c985cb5b0568eed67a3c2602ea32a
commita487fb74ce4c985cb5b0568eed67a3c2602ea32a[log] [tgz]
authorMarc Kupietz <kupietz@ids-mannheim.de>Thu Jul 23 15:16:59 2026 +0200
committerMarc Kupietz <kupietz@ids-mannheim.de>Thu Jul 23 15:38:23 2026 +0200
treee65f42505faa7abf4d5bc2ae68cd29a52b1dd022
parent817166976b2942cf793ea01c33c1d358ac61f76f [diff]
Render emoji with a Chrome-PDF-compatible Twemoji build

The previous attempt (8171669, reverted in 8abef81) installed upstream
Twemoji's own release, which uses the SVGinOT color-font format. Chrome
renders SVGinOT in color on screen, but its print-to-PDF path doesn't
support it and silently falls back to the font's monochrome outline
glyphs -- confirmed via `pdffonts` showing the embedded glyphs as a
plain (non-color) font subset in a real CI-built poster.

Fedora's twitter-twemoji-fonts package instead ships Twemoji as
CBDT/CBLC (bitmap glyphs), the same technology Noto Color Emoji uses,
which Chrome does support for PDF export (verified locally: embeds as
a color Type 3 font, and renders correctly in the printed poster).
Extract just the .ttf from Fedora's RPM via rpm2cpio/cpio rather than
adding a whole extra package repository.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Change-Id: Ic6168efa44af3b0a84ecdb643e483d107aaac547
2 files changed
tree: e65f42505faa7abf4d5bc2ae68cd29a52b1dd022
  1. .github/
  2. ci/
  3. images/
  4. inst/
  5. man/
  6. R/
  7. vignettes/
  8. .gitattributes
  9. .gitignore
  10. .gitlab-ci.yml
  11. .Rbuildignore
  12. .travis.yml
  13. DESCRIPTION
  14. LICENSE
  15. NAMESPACE
  16. posterdown.ids.Rproj
  17. README.md
README.md

IDS Mannheim CD adaptation to the posterdown R package

Example Poster

Automatically generated from skeleton.Rmd:

Getting Started

Install with:

remotes::install_git("https://korap.ids-mannheim.de/gerrit/IDS-Mannheim/posterdown")

Now add this to the YAML options of your rmarkdown (.Rmd) file:

---
output: 
  posterdown.ids::posterdown_ids
---

For further customization options please see the (currently in progress :hammer:) wiki

Additional metadata / customization for IDS version, e.g.:

subtitle: Using RMarkdown and `posterdown.ids::posterdown_ids`
contact:
    name: Marc Kupietz
    department: Digital Linguistics
    email: kupietz@ids-mannheim.de
    website: "http://korap.ids-mannheim.de/instance/icc"
    qrlink: >
      `r posterdown.ids::qrlink('https://gitlab.ids-mannheim.de/ids/posterdown')`
second_logo:
  url: https&#58;//raw.githubusercontent.com/brentthorne/posterdown/master/images/betterhexlogo.png
  margin-left: 14.5cm

To switch to German language, add the following to the YAML options:

lang:
  de: true

Use without R for plain markdown

Install pandoc, create a simple poster.md file, for example:

---
title: "A Simple Test Poster"
contact:
  name: "Marc Kupietz"
  website: "https://corpora.ids-mannheim.de/derekovecs"
  department: "Digital Linguistics"
  email: "kupietz@ids-mannheim.de"
author:
  - name: "Marc Kupietz"
date: "2024-06-05"
affiliation:
  address: "IDS Mannheim"
---

# Introduction

bla bla bla

# Methods

bla bla bla

# Results

bla bla bla

# Discussion

bla bla bla

Then run the following command:

pandoc poster.md --to html4 --from markdown+autolink_bare_uris+tex_math_single_backslash --wrap preserve --section-divs --template https://gitlab.ids-mannheim.de/ids/posterdown/-/raw/master/inst/rmarkdown/templates/posterdown_ids/resources/template.html?ref_type=heads --highlight-style pygments '--mathjax=https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML' --citeproc --output poster.html

View the resulting poster.html in your browser and print it as a PDF (don´t forget to tick print backgrounds and possibly select only the first page).

Alternatively, ci/html2pdf converts the HTML to an A0 PDF with exact dimensions and automatic hyphenation:

ci/html2pdf poster.html poster.pdf

Printing on fabric

When printing on light fabric, solid black tends to bleed out, making QR codes hard to scan and text fuzzy. ci/pdf-lighten-black produces a variant of a finished PDF in which all vector black is replaced by a dark grey (default 15%, configurable), while text and graphics stay vector and embedded raster images are untouched:

ci/pdf-lighten-black poster.pdf poster_fabric.pdf        # 15% grey
ci/pdf-lighten-black poster.pdf poster_fabric.pdf 0.25   # lighter, if black still bleeds

The CI workflow builds this variant automatically as target/skeleton_fabric.pdf.