How to optimise images?

[ericmp33]

Shouldn't the image be lighter after optimising it?

$filePath = public_path('img/testImg.png');

dd(
    \Illuminate\Support\Number::fileSize(
        bytes: filesize($filePath),
        precision: 3,
    ),

    \Spatie\Image\Image::load($filePath)
        ->optimize()
        ->save()
    ,

    \Illuminate\Support\Number::fileSize(
        bytes: filesize($filePath),
        precision: 3,
    ),
);

[ericmp33]

I missed installing the optimizers in the system - https://github.com/spatie/image-optimizer#optimization-tools