fastpng

0.1.9

Read and Write PNG Files with Configurable Decoder/Encoder Options

1packages depend

2.9Kdownloads / year

50.9%test coverage

13/13checks pass

Overview

About

Maintained by Mike ChengFirst published 2024-09-044 releasesCRAN page ↗GitHub ↗

Read and write PNG images with arrays, rasters, native rasters, numeric arrays, integer arrays, raw vectors and indexed values. This PNG encoder exposes configurable internal options enabling the user to select a speed-size tradeoff. For example, disabling compression can speed up writing PNG by a factor of 50. Multiple image formats are supported including raster, native rasters, and integer and numeric arrays at color depths of 1, 2, 3 or 4. 16-bit images are also supported. This implementation uses the 'libspng' 'C' library which is available from https://github.com/randy408/libspng/.

Install

R (CRAN)pak (dev)Ubuntu (r2u)

install.packages("fastpng", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("coolbutuseless/fastpng")

Development version from coolbutuseless/fastpng. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-fastpng

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled.

bspm (used by r2u) also needs make: sudo apt install make

Health

CRAN checks

13OK

Slowest check: 1.8 min · r-oldrel-macos-x86_64

Code health

Yes

Tests · ratio 2.98

50.9%

Coverage · measured lines

100%

Documentation · exports

Dependencies · direct

Check history

OK2026-07-19
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
WARNING2026-07-16
12 OK · 0 NOTE · 1 WARNING · 0 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMENoVignettesYes · dynamicpkgdown siteNoNEWSYes · 100% structuredCode of conductNoContributing guideNo

Examples that run: 100%
Documented parameters: 88%
Return-value docs: 80%
References docs: 0%

Downloads

2.9K

CRAN downloads in the past year

Rank #12,279 · ~8/day · ~241/mo

Releases R versions

Daily download trend is not available in this view yet.

33530 days

84890 days

2.9K1 year

Compare downloads with other packages →

Also on442 r2u

Repository

GitHub ↗ coolbutuseless/fastpng

20Stars

1Forks

2Open issues

0Open PRs

0Releases

103Commits

1Contributors

103 commits · Last activity 2026-07-18 · 0% stars, 30d

Stars over time

2025-06-12 · 182026-07-07 · 20

Repository practices

Upstream repositoryBeta

4 development-tooling and community-health practices detected across 3 families in the upstream repository

Checks run against github.com/coolbutuseless/fastpng on 2026-07-19.

Continuous integration (1)

GitHub Actions

Reproducibility and dev environment (2)

data-raw/Dev Container

Docs source (1)

README.Rmd

How this is detected·Detection ruleset v1 (2026-07-18)

Dependencies

Declared dependencies

6 external dependencies (excludes base and recommended)

Depends (1)

R >= 4.1.0

Imports (1)

colorfast

LinkingTo (1)

colorfast

Suggests (4)

knitr png rmarkdown testthat

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

1direct

0indirect

nara

Code & Tests

People & History

People (13)

Maintainer (1)

Mike Cheng

Author, Maintainer, Copyright holder

Authors (3)

Mike Cheng

Author, Maintainer, Copyright holder

Randy408

Author, Copyright holder

The PNG Reference Library Authors

Author, Copyright holder

Contributors (5)

Contributor

Contributor

Contributor

Contributor

Contributor

Author, Maintainer, Copyright holder

Randy408

Author, Copyright holder

The PNG Reference Library Authors

Author, Copyright holder

Arm Holdings

Andreas Dilger

Glenn Randers-Pehrson

Guy Eric Schalnat

Cosmin Truta

Listed in earlier versions (1)

Randy408 randy408@protonmail.com

no longer listed · 0.1.5 to 0.1.9

Package Timeline

4 releases. Pick two to compare their code metrics. R releases are shown for context.

0.1.9Latest
2026-07-18 · current release · diff ↗
R
R 4.6.0 released · 2026-04-24
0.1.8
2026-02-27 · diff ↗
R
R 4.5.0 released · 2025-04-11
0.1.7
2025-01-14 · diff ↗
0.1.5
2024-09-04
R
R 4.4.0 released · 2024-04-24

Package metadata

First published: 2024-09-04
Total releases: 4 / 2 yrs
License: MIT + file LICENSE OSI
Minimum R: ≥ 4.1.0
Bundled data: 2.2 MB / 1 file
Download size: 2.9 MB
Installed size: not tracked yet
With dependencies: not tracked yet

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