[WordPress] 外掛分享： AVIF Local Support

內容簡介

AVIF Local Support 是一款專為重視視覺品質和完全控制的網站擁有者設計的外掛，所有圖像轉換均在本地伺服器上進行，無需訂閱或外部服務，確保圖像質量優先。

【主要功能】
• 本地處理：所有轉換在伺服器上進行
• 質量優先：使用 LANCZOS 調整，保留元數據
• 完全可調：可控制質量、速度和色彩子取樣
• 智能回退：支持 AVIF 的瀏覽器顯示 AVIF，其他顯示 JPEG
• 自動轉換：上傳時或定期掃描自動轉換
• LQIP 佔位符：生成低品質圖像佔位符以平滑加載

外掛標籤

開發者團隊

📦 歷史版本下載

0.1.30.1.50.1.60.1.70.2.10.2.20.2.30.2.40.2.50.2.60.2.70.2.80.2.90.3.00.4.20.4.50.4.60.4.70.4.80.4.90.5.00.5.10.5.30.5.40.5.50.5.60.5.70.5.80.5.90.6.00.6.10.6.20.6.3trunk0.5.100.5.110.5.130.5.140.5.150.5.160.5.170.5.180.5.190.5.200.5.210.5.220.5.23

原文外掛簡介

Built by a Boston photographer for site owners who care about visual quality and full control. This plugin prioritizes image quality over everything else — no subscriptions, no external services.
Features

Local Processing — All conversion happens on your server. No subscriptions or external API calls. Works great on a shared CPU with 2GB RAM.
Quality First — Uses LANCZOS resizing, preserves ICC color profiles, and keeps EXIF/XMP/IPTC metadata intact.
Fully Tunable — Control quality (0–100), speed (0–10), chroma subsampling (4:2:0, 4:2:2, 4:4:4), and bit depth (8/10/12-bit).
Smart Fallback — Serves AVIF to supported browsers, JPEG to everyone else via picture elements.
Automatic Conversion — Convert on upload or via daily scheduled background scans.
LQIP Placeholders — Generate ThumbHash-based low-quality image placeholders for smooth loading.

How It Works
Front end: The plugin wraps your img tags in picture elements with an AVIF source. Browsers that support AVIF load the smaller, higher-quality file — others gracefully fall back to JPEG.
Conversion: Uses ImageMagick CLI (fastest), Imagick PHP extension (high quality), or GD Library (fallback) to convert JPEGs to AVIF on upload or via background jobs.
LQIP: Generates compact (~30 byte) ThumbHash placeholders that display instantly while images load.
Server Setup
The plugin supports three conversion engines, in order of preference:
ImageMagick CLI (Fastest, Recommended)
Uses the ImageMagick command-line binary directly:

System binary: ImageMagick 7.x built with HEIF/AVIF support (via libheif)
No PHP extension required
Benefits: Fastest performance, LANCZOS resizing, full metadata preservation (EXIF, XMP, IPTC, ICC)
Typical paths: /usr/bin/magick, /usr/local/bin/magick, or Homebrew on macOS

To verify AVIF support:
magick -list format | grep -i avif

Imagick PHP Extension (High Quality)
Uses the PHP Imagick extension:

PHP extension: imagick
System libraries: ImageMagick built with HEIF/AVIF support (via libheif)
Benefits: LANCZOS resizing, full metadata preservation (EXIF, XMP, IPTC, ICC), color profile handling

To install on Ubuntu/Debian:
apt install php-imagick imagemagick libheif-dev

GD Library (Fallback)
Uses PHP’s built-in GD library:

PHP extension: gd built with AVIF support (provides imageavif on PHP 8.1+)
Note: Some distro builds omit AVIF support; limited metadata preservation

MIME Type Configuration
Ensure your web server is configured to serve .avif files as image/avif.
Documentation

ImageMagick installation
PHP Imagick installation
PHP GD installation
ImageMagick format support

Need help with setup?
If you’re not sure what to install or upgrade, copy your Server Diagnostics from the plugin status/tools screen (or run wp avif status --format=json) and paste it into an LLM.
Example prompt:
I need AVIF support for WordPress. Based on this diagnostics output, give me step-by-step commands to install or upgrade ImageMagick, libheif, and PHP Imagick on my server.

After applying changes, verify with:
wp avif status
magick -list format | grep -i avif

WP-CLI Commands

Manage AVIF conversions from the command line.
Status
Show system status and AVIF support diagnostics:
wp avif status
wp avif status --format=json

Convert
Convert JPEG images to AVIF format:
wp avif convert --all
wp avif convert 123
wp avif convert --all --dry-run

Options:

— Specific attachment ID to convert
--all — Convert all attachments missing AVIF versions
--dry-run — Show what would be converted without actually converting

Statistics
Show AVIF conversion statistics:
wp avif stats
wp avif stats --format=json

Logs
View or clear conversion logs:
wp avif logs
wp avif logs --limit=50
wp avif logs --clear

Options:

--clear — Clear all logs
--limit= — Number of logs to show (default: 20)

Delete
Delete AVIF files for an attachment or all attachments:
wp avif delete 123
wp avif delete --all --yes

Options:

— Attachment ID to delete AVIF files for
--all — Delete all AVIF files in the media library
--yes — Skip confirmation prompt when using –all

LQIP Commands
Manage LQIP (ThumbHash) placeholders:
wp lqip stats
wp lqip generate --all --force
wp lqip generate 123
wp lqip delete --all --yes

For more information, visit wp-cli.org.
Contributing
Contributions welcome! Please submit issues and pull requests on GitHub.
License
GPL v2 or later — View License

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