Storefront image sizes

storefront-image-sizes.php

<?php
add_theme_support( 'woocommerce', apply_filters( 'storefront_woocommerce_args', array(
  'single_image_width'    => 416,
  'thumbnail_image_width' => 324,
  'product_grid'          => array(
    'default_columns' => 3,
    'default_rows'    => 4,
    'min_columns'     => 1,
    'max_columns'     => 6,
    'min_rows'        => 1
  )
) ) );