If you've ever run into the issue where going into the media library > editing an image > and the image that might be used in a custom field isn't updated on the post this will fix that.

image-crop-udpate.php

/**
 * This will update image sizes on save
 */
function add_image_options($data){
    global $_wp_additional_image_sizes;
    foreach($_wp_additional_image_sizes as $size => $properties){
        update_option($size."_size_w", $properties['width']);
        update_option($size."_size_h", $properties['height']);
        update_option($size."_crop", $properties['crop']);
    }
    return $data;
}
add_action('image_editor_save_pre', 'add_image_options');