# jbig2enc を Homebrew, apk, MacPorts, Nix, apt でインストール jbig2enc 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:jbig2enc ``` 追加のインストールコマンド: ### macOS - Homebrew (100%): ```sh brew install jbig2enc ``` 証拠: local Homebrew formula metadata - MacPorts (94%): ```sh sudo port install jbig2enc ``` 証拠: MacPorts ports tree: graphics/jbig2enc/Portfile from https://api.github.com/repos/macports/macports-ports/git/trees/master?recursive=1 ### Linux - apk (92%): ```sh sudo apk add jbig2enc ``` 証拠: Alpine Linux edge package indexes: jbig2enc from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz - Nix (92%): ```sh nix profile install nixpkgs#jbig2enc ``` 証拠: nixpkgs package indexes: pkgs/by-name/jb/jbig2enc/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 - Debian apt (92%): ```sh sudo apt install jbig2 ``` 証拠: Debian stable package indexes: jbig2 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz ## パッケージ情報 - **パッケージキー:** brew:jbig2enc - **パッケージマネージャ:** Homebrew - **バージョン:** 0.32 - **ソース概要:** JBIG2 encoder (for monochrome documents) - **ホームページ:** - **リポジトリ:** - **最終更新:** 2026-06-19T22:36:09Z - **生成日時:** 2026-08-03T19:37:03+00:00 ## 実行可能ファイル - jbig2 (エイリアス) - jbig2topdf.py (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: 0.32 ## プロジェクトの歴史と使われ方 jbig2enc is a command-line JBIG2 encoder for monochrome document images. Its README describes JBIG2 as a bi-level image format that can outperform Group 4 fax compression and says the tool can generate JBIG2 streams, fragments for embedding in PDFs, symbol extraction and classification, refinement coding, and multipage document compression. ### プロジェクトの歴史 The public GitHub repository was created in 2009, and the bundled ChangeLog records releases as early as the 0.21-era work on PDF output and old-book scans. The project grew around Leptonica integration, with repeated releases updating Leptonica compatibility, Windows build support, autotools, CMake, Meson, and the helper script later named jbig2topdf.py. ### 採用の歴史 Homebrew packages the executable as jbig2enc, while Debian and Ubuntu expose the related command through a jbig2 package name. OCRmyPDF documentation treats a JBIG2 encoder as an optional but recommended component for smaller OCR-produced PDFs, which is one of the main reasons the encoder matters in Unix packaging even though the upstream project is small. ### 使われ方 Typical usage is document-pipeline work: encode scanned bilevel images with jbig2, then use jbig2topdf.py to wrap the JBIG2 output into a PDF. The README also documents standalone .jb2 output and sample commands for multi-image PDF creation. ### パッケージ好きにとっての重要性 jbig2enc sits at an awkward packaging boundary: it is a tiny specialist encoder, but it unlocks much smaller scanned-document PDFs for tools higher in the stack. Packagers also care about its history because JBIG2 patent concerns long affected distribution decisions, while later releases focused on build-system portability and memory-safety fixes. ### タイムライン - 2009: Public GitHub repository created and version 0.27 recorded with Leptonica 1.58 support. - 2012: Version 0.28 added autotools support, a Visual C++ solution, version reporting, and PDF DPI fixes. - 2017: Version 0.29 fixed builds with Leptonica 1.70 and adjusted reference counting. - 2024: Version 0.30 moved PDF helper support to Python 3, added CMake, standalone .jb2 support, DPI options, and ARM endian fixes. - 2026: Versions 0.31 and 0.32 added build-system work, CI improvements, argument checks, C++17 requirements, and memory-leak fixes. ### Related projects - The README names Leptonica as a required imaging library and links related jbig2enc sample and minidjvu projects. In package-manager use it is often encountered through OCRmyPDF and other scanned-document workflows. ### ソース - - - - - ## 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 - jbig2 - 0.30-1: normalized package name match | Debian stable package indexes: jbig2 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | encoder for JBIG2 - command-line tool | https://github.com/agl/jbig2enc - Debian apt - libjbig2enc-dev - 0.30-1: normalized package name match | Debian stable package indexes: libjbig2enc-dev from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | encoder for JBIG2 - development headers | https://github.com/agl/jbig2enc - Debian apt - libjbig2enc0t64 - 0.30-1: normalized package name match | Debian stable package indexes: libjbig2enc0t64 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | encoder for JBIG2 - libraries | https://github.com/agl/jbig2enc - Nix - jbig2enc: normalized package name match | nixpkgs package indexes: pkgs/by-name/jb/jbig2enc/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 - Ubuntu apt - jbig2 - 0.29-2.1build1: normalized package name match | Ubuntu 24.04 LTS package indexes: jbig2 from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | encoder for JBIG2 - command-line tool | https://github.com/agl/jbig2enc - Ubuntu apt - libjbig2enc-dev - 0.29-2.1build1: normalized package name match | Ubuntu 24.04 LTS package indexes: libjbig2enc-dev from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | encoder for JBIG2 - development headers | https://github.com/agl/jbig2enc - Ubuntu apt - libjbig2enc0t64 - 0.29-2.1build1: normalized package name match | Ubuntu 24.04 LTS package indexes: libjbig2enc0t64 from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | encoder for JBIG2 - libraries | https://github.com/agl/jbig2enc - apk - jbig2enc - 0.30-r0: normalized package name match | Alpine Linux edge package indexes: jbig2enc from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | JBIG2 Encoder | https://github.com/agl/jbig2enc - apk - jbig2enc-dev - 0.30-r0: normalized package name match | Alpine Linux edge package indexes: jbig2enc-dev from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | JBIG2 Encoder (development files) | https://github.com/agl/jbig2enc - apk - jbig2enc-doc - 0.30-r0: normalized package name match | Alpine Linux edge package indexes: jbig2enc-doc from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | JBIG2 Encoder (documentation) | https://github.com/agl/jbig2enc - apk - jbig2enc-static - 0.30-r0: normalized package name match | Alpine Linux edge package indexes: jbig2enc-static from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | JBIG2 Encoder (static library) | https://github.com/agl/jbig2enc - MacPorts - jbig2enc: normalized package name match | MacPorts ports tree: graphics/jbig2enc/Portfile from https://api.github.com/repos/macports/macports-ports/git/trees/master?recursive=1 ## Combined YAML source View the package source record on GitHub. [combined/jbig2enc.yml](https://github.com/mxcl/pkgdb/blob/main/combined/jbig2enc.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