pixelfed/config/image-optimizer.php

<?php

use Spatie\ImageOptimizer\Optimizers\Svgo;
use Spatie\ImageOptimizer\Optimizers\Optipng;
use Spatie\ImageOptimizer\Optimizers\Gifsicle;
use Spatie\ImageOptimizer\Optimizers\Pngquant;
use Spatie\ImageOptimizer\Optimizers\Jpegoptim;

return [
    /*
     * When calling `optimize` the package will automatically determine which optimizers
     * should run for the given image.
     */
    'optimizers' => [

        Jpegoptim::class => [
            '-m75', // set maximum quality to 75%
            '--strip-all',  // this strips out all text information such as comments and EXIF data
            '--all-progressive',  // this will make sure the resulting image is a progressive one
        ],

        Pngquant::class => [
            '--force', // required parameter for this package
        ],

        Optipng::class => [
            '-i0', // this will result in a non-interlaced, progressive scanned image
            '-o7',  // this set the optimization level to two (multiple IDAT compression trials)
            '-strip all',
            '-quiet', // required parameter for this package
        ],

        Svgo::class => [
            '--disable=cleanupIDs', // disabling because it is know to cause troubles
        ],

        Gifsicle::class => [
            '-b', // required parameter for this package
            '-O3', // this produces the slowest but best results
        ],
    ],

    /*
     * The maximum time in seconds each optimizer is allowed to run separately.
     */
    'timeout' => 60,

    /*
     * If set to `true` all output of the optimizer binaries will be appended to the default log.
     * You can also set this to a class that implements `Psr\Log\LoggerInterface`.
     */
    'log_optimizer_activity' => true,
];