image-pagination-links.php

<?php

function force_orderby_post_name($wp_query) {
	$wp_query->query_vars['orderby'] = 'post_name';
	$wp_query->query_vars['order'] = 'ASC';
}

function previous_image_link_by_slug($size = 'thumbnail', $text = false) {
	add_filter('pre_get_posts', 'force_orderby_post_name', 11);
	previous_image_link($size, $text);
	remove_filter('pre_get_posts', 'force_orderby_post_name', 11);
}

function next_image_link_by_slug($size = 'thumbnail', $text = false) {
	add_filter('pre_get_posts', 'force_orderby_post_name', 11);
	next_image_link($size, $text);
	remove_filter('pre_get_posts', 'force_orderby_post_name', 11);
}