macOS
Homebrewverified · 100%
brew install snglocal Homebrew formula metadata
brew
Install sng with Homebrew, apt, dnf, Nix
Enable lossless editing of PNGs via a textual representation. Version 1.1.1 via Homebrew; verified from local package data.
install
Additional install commands
Linux
Debian aptverified · 92%
sudo apt install sngDebian stable package indexes · sng · source: deb.debian.org
Fedora dnfverified · 92%
sudo dnf install sngFedora Rawhide package metadata · sng · source: dl.fedoraproject.org
Nixverified · 92%
nix profile install nixpkgs#sngnixpkgs package indexes · pkgs/by-name/sn/sng/package.nix · source: api.github.com
overview
Package summary
Enable lossless editing of PNGs via a textual representation
Project links
Commands and aliases
- sng
history
Project history and usage
SNG, Scriptable Network Graphics, is a textual representation for PNG files plus a compiler/decompiler named sng. It enables lossless editing of PNG structure and ancillary chunks using text tools.
Project history
The official NEWS file records a private pre-alpha release in December 1999, a public alpha days later, and a 1.0.0 production release in July 2001. The project is maintained by Eric S. Raymond and hosted on SourceForge with an official Git code browser.
Adoption history
SNG has stayed small but packageable: the official README says the code is commonly packaged as sng, and the supplied package facts list Homebrew, Debian/Ubuntu, Fedora, and Nix packages.
How it is used
The sng program translates PNG to SNG and SNG back to PNG. Official documentation emphasizes viewing and editing obscure ancillary chunks and generating PNG content from scripts.
Why package nerds care
SNG is classic Unix packaging material: a small C command-line tool, a man page, a regression test, libpng dependency, and a stable file-format niche that has survived many libpng transitions.
Timeline
- 1999: Pre-alpha private release and public alpha release.
- 2001: 1.0.0 production release.
- 2015: 1.1.0 release updates libpng compatibility and fixes Mac OS X color database lookup.
- 2024: 1.1.1 improves documentation and drops autoconfig.
- 2026: 1.1.2 release listed on the official resource page.
Related projects
- The official homepage relates SNG to PNG, libpng, the PNG test suite, and gif2png.
Sources
security posture
Risk level: green
narrow executable package without higher-risk signals.
Risk classifier
green risk · low confidence · appliance
Why
- narrow executable package without higher-risk signals
Signals
- metadata:no-higher-risk-signals
Install behavior
- No Homebrew post-install hook is recorded in formula metadata.
- Homebrew bottle metadata is available for 10 platform targets.
- Installs with 2 runtime dependencies.
Recommended review
Before unattended agent use, check whether the tool reads plaintext credentials, writes remote state, publishes artifacts, or shells out to plugins.
executables
Installed executables
| Command | Kind | Exposure | Note |
|---|---|---|---|
sng | cli | global executable |
freshness
Version and freshness
These signals separate page generation age, package-manager activity, and upstream release comparison. Version lag is warned only when an evidence URL and comparable versions are present.
page generated2026-07-08
manager version1.1.1
manager updated
local dataok
upstreamnot checked
latest detectednot detected
- infoNo package-manager update timestamp was available.low confidence
- infoRelease/tag comparison is only available for GitHub repositories.https://sng.sourceforge.net/none confidence
install metadata
Package metadata
| Package key | brew:sng |
|---|---|
| Version | 1.1.1 |
| Package manager | Homebrew |
| Package manager page | https://formulae.brew.sh/formula/sng |
| Homepage | https://sng.sourceforge.net/ |
| Repository | https://sourceforge.net/p/sng/code |
| Upstream docs | https://sng.sourceforge.net/ |
| License | Zlib |
| Source archive | https://downloads.sourceforge.net/project/sng/sng-1.1.1.tar.xz |
| Dependencies | libpng, xorgrgb |
| Bottle | available (on arm64_linux, arm64_monterey, arm64_sequoia, arm64_sonoma, arm64_tahoe, arm64_ventura, monterey, sonoma, ventura, x86_64_linux) |
| Homebrew post-install | not defined |
| Service | none declared |
registry facts
Source database details
| Source Database | Homebrew formula API |
|---|---|
| Tap | homebrew/core |
| Full Name | sng |
| Version Scheme | 0 |
| Revision | 0 |
| Bottle Stable Root URL | https://ghcr.io/v2/homebrew/core |
| Deprecated | no |
| Disabled | no |
| Keg Only | no |
| URL Keys |
|
source database matches
Other package-manager records
Matches are pulled from external package-manager indexes and kept separate from local Automic Vault package links.
Debian apt95%
sng 1.1.1-1
specialized markup language for representing PNG contents
sudo apt install sng- Section: graphics
- Architecture: amd64
- 3 dependencies
- normalized package name match
- Matched by: Sng
Nix95%
sng
nix profile install nixpkgs#sng- normalized package name match
- Matched by: Sng
Ubuntu apt95%
sng 1.1.0-4build2
specialized markup language for representing PNG contents
sudo apt install sng- Section: universe/graphics
- Architecture: amd64
- 3 dependencies
- normalized package name match
- Matched by: Sng
dnf95%
sng 1.1.1-8.fc44
Lossless editing of PNGs via a textual representation
sudo dnf install sng- License: Zlib
- Category: Unspecified
- Architecture: x86_64
- Source Package: sng
- 4 dependencies
- 1 provides
- normalized package name match
- Matched by: Sng
source trail
Generated from repository data
This page is generated by av-web from the private package SQLite artifact built by scripts/generate-pkg-sqlite.py.
Combined YAML source
View the package source record on GitHub.
Used sources
- Geiger risk classifier
- Nucleus package database
- av.db category and tag curation
- cross-ecosystem install command graph
- curated package history
- external package-manager database matches
- package relationship graph
- package version freshness
- package-page enrichment