IDX+ - Use a larger thumbnail size in galleries, good for Retina displays

idx-plus-larger-gallery-thumbnails.php

<?php
/*
* Plugin Name: IDX+ - Increase Gallery Thumbnail Size
* Description: Use a larger thumbnail size in IDX+ - good for Retina displays
* Version: 1.0
* Author: Katz Web Services, Inc.
* Author URI: http://www.idxplus.net
*/

add_filter('idx_plus_gallery_thumbnail_size', 'modify_idx_plus_gallery_thumbnail_size'); 

/**
 * Change the size of the thumbnail images. If you want Retina thumbnails, use 'medium'
 *
 * @param string $size Size of images ('tiny', 'medium', or 'full')
 */
function idx_plus_gallery_thumbnail_size( $size = 'tiny' ) {
	return 'medium';
}