at_post_thumbnail_placeholder

With this filter you can adjust the default placeholder-images in the theme.

add_filter('at_post_thumbnail_placeholder', 'at_set_new_placeholder', 11, 4);
function at_set_new_placeholder($url, $post_id, $size, $args) {
	if($size == 'at_thumbnail') {
		$url = 'https://placeholdit.imgix.net/~text?txtsize=34&txt=360%C3%97189&w=360&h=189';
	}
	
	return $url;
}

With this you have the option to deposit for any size its own placeholder-image. You just have to adjust the URL. You can control this for individual products via $post_id.

A list of all currently defined sizes in the theme:

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