Kirby ImageMagick Extended

This plugin extends Kirby's built-in ImageMagick driver with features for working with animated or multi-layer images.

The issue

When converting an animated image to another format, ImageMagick converts each frame individually and outputs them as separate files with suffixes. This is not ideal for Kirby, as it expects the output to be a single image file. This plugin solves the issue by checking each image upfront converting for its frame count, and will then specify to convert the first frame only if the target format does not support multiple frames. It also adds a new option frame to manually specify the frame index. Additionally, this plugin adds support for APNGs images, which are unsupported because ImageMagick by default needs to be told to treat them as animated images.

The detection of available image frames requires the identify command to be available, which can be seen as breaking change, hence the creation of this plugin as it's unlikely to be merged in Kirby Core for fixing a variety of very niche edge case scenarios.

Requirements

• Kirby 3.8+
• PHP 8.0+
• ImageMagick 7.0+ with convert and identify commands

Installation

Download

Download and copy this repository to /site/plugins/kirby-magick-extended.

Composer

composer require tobimori/kirby-magick-extended

Usage

Set driver in config

// site/config/config.php

return [
  'thumbs.driver' => 'im-extended',
];

When applied, the plugin will already automatically detect animated images and convert only the first frame, if the target format is unsupported.

Use frame option

// In your template file

<?php if($image = $page->animated()->toFile()) :
  $thumbOptions = [
    'width' => 100,
    'height' => 100,
    'frame' => 0, // specify frame index
    'format' => 'png',
  ]; ?>
  <img src="<?= $image->thumb($thumbOptions)->url() ?>" />
<?php endif ?>

Disable APNG detection

// In your template file

<?php if($image = $page->animated()->toFile()) :
  $thumbOptions = [
    'width' => 100,
    'height' => 100,
    'apng' => false, // disable APNG detection
    'format' => 'png',
  ]; ?>
  <img src="<?= $image->thumb($thumbOptions)->url() ?>" />
<?php endif ?>

Custom identify binary path

// site/config/config.php
return [
  'thumbs' => [
    'identifyBin' => 'identify',
  ],
];

Future?

• Add unit tests from PR
• Add APNG support with auto-prefixing of APNG:
• Get approved to be merged into Kirby Core - tracked in PR #4275

Credits

This plugin extends Kirby's ImageMagick driver, originally written by Bastian Allgeier, licensed under MIT License.

License

MIT License Copyright © 2023 Tobias Möritz