# tiff2png を Homebrew でインストール

tiff2png 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:tiff2png
```

追加のインストールコマンド:

### macOS

- Homebrew (100%):

```sh
brew install tiff2png
```

  証拠: local Homebrew formula metadata

## パッケージ情報

- **パッケージキー:** brew:tiff2png
- **パッケージマネージャ:** Homebrew
- **バージョン:** 0.92
- **ソース概要:** TIFF to PNG converter
- **ホームページ:** <http://www.libpng.org/pub/png/apps/tiff2png.html>
- **リポジトリ:** <https://github.com/rillian/tiff2png>
- **生成日時:** 2026-08-03T19:37:03+00:00

## 実行可能ファイル

- tiff2png (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: 0.92
## プロジェクトの歴史と使われ方

tiff2png is a small command-line converter for turning TIFF images into PNG files. Its official libpng-hosted page describes the main goal as direct TIFF-to-PNG conversion while preserving alpha transparency, scaling information, and user-controlled compression.

### プロジェクトの歴史

The official page credits Willem van Schaik, Greg Roelofs, and Ralph Giles as authors and presents version 0.92 as the current release. It also records earlier lineage through Willem van Schaik's separate 0.7 offshoot, labelled 0.82, and explains behavioral differences around wildcard batch conversion and overwrite handling.

The project sits close to the PNG ecosystem rather than the modern image-toolkit world: the official page is hosted under libpng's PNG applications area and lists libpng, zlib, libtiff, and IJG JPEG libraries as supporting components.

### 採用の歴史

The official page lists source tarballs, a GitHub repository, git mirrors, and older platform binaries for systems including SCO OpenServer and 32-bit Windows. That distribution style reflects an older portable C utility that survived through source archives, mirrors, and package-manager formulas.

Homebrew keeps tiff2png available as a narrow utility for users who want one conversion command rather than a full ImageMagick-style suite.

### 使われ方

tiff2png is used for batch conversion, with the official page giving a wildcard example such as converting multiple .tiff files at once. It is especially relevant when users care about preserving transparency while producing PNG output.

For package users, the practical use case is scripted image conversion in build, publishing, archival, or web pipelines where a dedicated TIFF-to-PNG binary is simpler than invoking a larger image-processing framework.

### パッケージ好きにとっての重要性

Its package-nerd significance is mostly historical and practical: it is the sort of small, old-school image utility that package managers preserve because scripts depend on exact command names and behaviors.

The official warning about a related offshoot lacking wildcard support and overwrite checks is a reminder that tiny conversion tools often matter because their edge-case behavior is part of the package contract.

### タイムライン

- 2000-2005, 2014: Copyright years shown on the official tiff2png page.
- 2000s: Official page documents version 0.92, older platform binaries, and support libraries.
- 2014: GitHub repository created for rillian/tiff2png as a libpng.org-derived conversion utility.

### Related projects

- The official page links the utility to libpng, zlib, libtiff, and the Independent JPEG Group library.
- The official page also notes Willem van Schaik's separate 0.82-labelled offshoot from version 0.7.

### ソース

- <http://www.libpng.org/pub/png/apps/tiff2png.html - official tiff2png page for purpose, authors, version, lineage, usage, source links, binaries, and supporting libraries.>
- <https://api.github.com/repos/rillian/tiff2png - GitHub repository metadata for creation date and description.>


## 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


## Combined YAML source

View the package source record on GitHub. [combined/tiff2png.yml](https://github.com/mxcl/pkgdb/blob/main/combined/tiff2png.yml)


## ソース

- pkg.so package database
- Geiger risk classifier
- curated package history
- pkgdb category and tag curation
- cross-ecosystem install command graph