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<?php
/* DON'T copy the first line (above) if your functions.php already has it. 
 * ---------------------------------------------------------------------- */
 
function my_et_divi_woocommerce_image_dimensions() {
	$catalog = array(
		'width' 	=> '400',
		'height'	=> '400',
		'crop'		=> 1,
	);
	$single = array(
		'width' 	=> '510',
		'height'	=> '9999',
		'crop'		=> 0,
	);
	$thumbnail = array(
		'width' 	=> '157',
		'height'	=> '157',
		'crop'		=> 1,
	);
	update_option( 'shop_catalog_image_size', $catalog );
	update_option( 'shop_single_image_size', $single );
	update_option( 'shop_thumbnail_image_size', $thumbnail );
}
add_action( 'admin_init', 'my_et_divi_woocommerce_image_dimensions', 50 );