display image size in media library screen

i’m trying to add image size in media library screen so will be simply to handle images. Anyone does it before me?
Any help appreciated.
Francesco

Code based on Custom Sortable Columns

add_filter('manage_upload_columns', 'size_column_register');

function size_column_register($columns) {

    $columns['dimensions'] = 'Dimensions';

    return $columns;
}

add_action('manage_media_custom_column', 'size_column_display', 10, 2);

function size_column_display($column_name, $post_id) {

    if( 'dimensions' != $column_name || !wp_attachment_is_image($post_id)) return;

    list($url, $width, $height) = wp_get_attachment_image_src($post_id, 'full');

    echo esc_html("{$width}×{$height}");
}