0e56ca6e63
Diagnosed visible faint grey rectangle around B&W ink art images on pages with pure-white backgrounds. Root cause was format encoder luminance shift in near-white pixels: Source JPG corner: (253,253,253) = #FDFDFD = 99.2% white AVIF q=65 (default): (250,250,250) = #FAFAFA = 98.0% (1.2% halo) WebP q=80 (default): (249,249,249) = #F9F9F9 = 97.6% (1.6% halo) Two changes: 1. avifenc now uses -y 444 (full chroma subsampling) instead of default 4:2:0. Brings AVIF corner to #FBFBFB = 98.4%, smaller file size as a bonus (~10% reduction on a typical art image). 2. WebP default quality raised 80 → 90. Reaches #FDFDFD = exact match with source JPG. File size increases ~30% but eliminates the halo entirely for WebP-capable browsers (vast majority). AVIF still has 0.4% residual halo (libavif 0.11.1 ceiling at this quality range — pushing higher yields no improvement, only file size). Acceptable tradeoff: WebP is the served-by-default fallback when AVIF isn't perfect. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
29 lines
975 B
PHP
29 lines
975 B
PHP
<?php
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/**
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* Plugin Name: H4B Image Optim
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* Plugin URI: https://gitea.help4bis.com/help4bis/h4b-image-optim
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* Description: ICC-safe image optimisation with WebP + AVIF generation. Replaces Smush Pro without the grey-wash bug. No CDN.
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* Version: 0.2.3
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* Author: help4bis (Henk + Claude)
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* Author URI: https://help4bis.com
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* License: GPL-2.0-or-later
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* License URI: https://www.gnu.org/licenses/gpl-2.0.txt
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* Requires PHP: 8.1
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* Requires at least: 6.4
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* Text Domain: h4b-image-optim
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*/
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if ( ! defined( 'ABSPATH' ) ) {
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exit;
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}
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define( 'H4B_IMG_OPTIM_VERSION', '0.2.3' );
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define( 'H4B_IMG_OPTIM_FILE', __FILE__ );
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define( 'H4B_IMG_OPTIM_DIR', plugin_dir_path( __FILE__ ) );
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define( 'H4B_IMG_OPTIM_URL', plugin_dir_url( __FILE__ ) );
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define( 'H4B_IMG_OPTIM_SLUG', 'h4b-image-optim' );
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require_once H4B_IMG_OPTIM_DIR . 'includes/class-plugin.php';
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H4B\ImageOptim\Plugin::instance()->boot();
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