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Henk 7e1c86f215 feat: initial v0.1.0 MVP

Replaces Smush Pro's optimisation pipeline without the grey-wash bug.

CLI commands working:
  wp h4b-img status
  wp h4b-img optimise --id=<n>
  wp h4b-img bulk
  wp h4b-img rescue

Verified on dev.rds.ink:
- ICC profile preservation works (the Smush-bug fix)
- Bulk: 20 attachments → 487 KB saved (10.4%), 0 errors
- Rescue: end-to-end mechanism verified on WorkingAsOne_horse fixture
- WebP synchronous, AVIF queued via WP-Cron
- Originals backed up to wp-content/h4b-img-originals/

See CHANGELOG.md for details + ../DESIGN-h4b-image-optim.md for architecture.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-05-19 13:41:03 +10:00

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CHANGELOG

All notable changes to h4b-image-optim will be documented here.

Format follows Keep a Changelog and Semantic Versioning.

[0.1.0] — 2026-05-19

Initial MVP. Replaces Smush Pro's optimisation pipeline without the grey-wash bug. CLI-only in this release (admin UI comes in 0.2).

Added

Plugin scaffold with PSR-12-style namespaced classes (H4B\ImageOptim\*)
Optimizer — in-place JPG / PNG re-encode using Imagick + jpegoptim / pngquant
- ICC profile preservation (the Smush-bug fix) via bundled sRGB v4 profile fallback
- 4:4:4 chroma subsampling for large images; 4:2:0 for small ones
- Configurable size threshold (min_optimise_bytes, default 20 KB) to skip thumbnails that re-encoding would inflate
- Atomic file replacement with ownership preservation
- GPS EXIF stripping on by default for privacy
- EXIF orientation applied before encode
Format_Generator — WebP (synchronous) + AVIF (queued via WP-Cron) siblings
Uploader_Hook — intercepts wp_generate_attachment_metadata
Attachment_Meta — per-attachment optimisation history in _h4b_img_optim
Rescue_Detector — PHP port of the Python grey-wash detector
Originals backup to wp-content/h4b-img-originals/ with 90-day cron prune
WP-CLI commands:
- wp h4b-img status — tool detection + settings dump
- wp h4b-img optimise --id=<n> — single-attachment optimise (+ --dry-run)
- wp h4b-img bulk — bulk-optimise unprocessed attachments (+ --limit, --force, --dry-run, --batch, --pause)
- wp h4b-img rescue — scan + optionally repair Smush-mangled JPGs from their .webp siblings (+ --scan, --apply, --min-severity, --csv, --manifest)
uninstall.php — clean removal of plugin options + cron, preserves user data (backups + .webp/.avif siblings + optimisation postmeta)

Required system tools (AlmaLinux 9 / Debian 13)

Tool	AlmaLinux	Debian
`cwebp`	`libwebp-tools`	`webp`
`jpegoptim`	`jpegoptim`	`jpegoptim`
`cjpeg` / `jpegtran`	`libjpeg-turbo-utils`	`libjpeg-turbo-progs`
`avifenc`	`libavif-tools`	`libavif-bin`
`pngquant`	`pngquant`	`pngquant`
`optipng`	`optipng`	`optipng`

Known limitations

No admin settings page (CLI/wp option only)
No Picture-tag rewriting on the_content (Smush still serving WebPs)
No .htaccess content-negotiation fallback
No migrate-from-smush command yet
No PHPUnit test suite yet

Verified against

AlmaLinux 9.7 / PHP 8.4.21 / Imagick 3.8.1 (production)
Debian 13 / PHP 8.4 / wordpress:php8.4-apache (dev container)
Tested on 20 rds.ink attachments in bulk mode: 487 KB saved (10.4%), 0 errors
Rescue mechanic verified end-to-end on the WorkingAsOne_horse900-800x524.jpg fixture

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