# apng2gif を Homebrew, apt, Nix でインストール
apng2gif のインストール経路、実行ファイル、メタデータ、AI エージェント向けセキュリティノートを確認します。
## インストール
```sh
sudo av install brew:apng2gif
```
追加のインストールコマンド:
### macOS
- Homebrew (100%):
```sh
brew install apng2gif
```
証拠: local Homebrew formula metadata
### Linux
- Debian apt (92%):
```sh
sudo apt install apng2gif
```
証拠: Debian stable package indexes: apng2gif from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz
- Nix (92%):
```sh
nix profile install nixpkgs#apng2gif
```
証拠: nixpkgs package indexes: pkgs/by-name/ap/apng2gif/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1
## パッケージ情報
- **パッケージキー:** brew:apng2gif
- **パッケージマネージャ:** Homebrew
- **バージョン:** 1.8
- **ソース概要:** Convert APNG animations into animated GIF format
- **ホームページ:**
- **生成日時:** 2026-08-03T19:37:03+00:00
## 実行可能ファイル
- apng2gif (エイリアス)
## インストール挙動
- Bottle: 利用不可
## バージョンと鮮度
- ページ生成日: 2026-08-03
- マネージャ版: 1.8
## プロジェクトの歴史と使われ方
apng2gif is a small SourceForge-hosted converter that turns Animated PNG files into animated GIFs. The official page says it respects APNG frame delays and loop counts while providing transparency-threshold and background-blending options.
### プロジェクトの歴史
The project page presents apng2gif as a focused APNG-to-GIF converter with both a command-line version and a Windows GUI. It is distributed through SourceForge along with source and prebuilt binaries for major desktop operating systems.
The SourceForge 1.8 file page records an improved APNG decoder based on apngdis 2.9, loop-count adjustment, duplicate-frame optimization, and 64-bit Windows binaries. That is about as much public project history as the official sources expose.
### 採用の歴史
apng2gif adoption is naturally narrow: it serves people who keep high-quality APNG masters but still need GIF output for older or more constrained web/image pipelines. The official page explicitly frames webmasters as a practical audience.
### 使われ方
The documented command line is apng2gif anim.png [anim.gif] [-t tlevel] [-b bcolor]. The -t option controls transparency threshold, the -b option blends against a background color, and -b overrides -t.
The project page describes converting 24/32-bit APNG to a single global 256-color GIF palette using a Wu quantization grid, which is the practical tradeoff behind the tool: keep APNG masters, generate GIF fallbacks when needed.
### パッケージ好きにとっての重要性
apng2gif is the kind of tiny media converter package that survives because it does one format edge case well. Its value is not breadth; it is a low-friction CLI for APNG fallback assets and batch conversion.
It also sits in a small APNG tools family where each utility handles one direction or maintenance step in an animated-image workflow.
### タイムライン
- 2017-05-19: The SourceForge 1.8 file page records source and binary artifacts and README text.
- 2017-05-22: The SourceForge 1.8 file page records the 32-bit Windows GUI binary.
- 1.8: Release notes record an improved decoder based on apngdis 2.9 and duplicate-frame optimization.
### Related projects
- The official page links gif2apng, apngasm, apngdis, and apngopt as related APNG tools.
### ソース
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## セキュリティノート
narrow executable package without higher-risk signals.
- **Geiger リスク:** グリーン / 低
- narrow executable package without higher-risk signals
## 他のパッケージマネージャ記録
- Debian apt - apng2gif - 1.8-5+b1: normalized package name match | Debian stable package indexes: apng2gif from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | tool for converting APNG images to animated GIF format | https://apng2gif.sourceforge.net
- Nix - apng2gif: normalized package name match | nixpkgs package indexes: pkgs/by-name/ap/apng2gif/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1
- Ubuntu apt - apng2gif - 1.8-5build2: normalized package name match | Ubuntu 24.04 LTS package indexes: apng2gif from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | tool for converting APNG images to animated GIF format | https://apng2gif.sourceforge.net
## Combined YAML source
View the package source record on GitHub. [combined/apng2gif.yml](https://github.com/mxcl/pkgdb/blob/main/combined/apng2gif.yml)
## ソース
- pkg.so package database
- Geiger risk classifier
- curated package history
- pkgdb category and tag curation
- external package-manager database matches
- cross-ecosystem install command graph