Changing lightbox image size

If it helps anyone else, there doesn’t seem to be a filter for this, but you can copy the \single-product\product-image.php template into your theme, and edit it as follows:

Replace

$image_link = wp_get_attachment_url( get_post_thumbnail_id() );

With

$image_link_array = wp_get_attachment_image_src( get_post_thumbnail_id(), 'large' );
$image_link = $image_link_array[0];

Just replace the ‘large’ image size with whichever size you want to use.

Well done, Mr Dunst, you are a gentleman indeed.

All that needs to be added is that the same thing needs to be done on the product-thumbnails.php template.

Many thanks for the lead.

I have applied it on African Scarves

Update: Not quite the same for product-thumbnails.php:

/**
* Get WooCommerce to use "large" images in the lightbox instead of the originals.
* Replace $image_link = wp_get_attachment_url( $attachment_id ); with the following two lines.
*/
$image_link_array = wp_get_attachment_image_src($attachment_id, 'large');
$image_link = $image_link_array[0];