lshowcase img filter

add_filter( 'intermediate_image_sizes', 'lshowcase_img_filter');

function lshowcase_img_filter ($sizes){

    $type = get_post_type($_REQUEST['post_id']);


    foreach($sizes as $key => $value){
     	/*
     	if($type=='lshowcase'  &&  $value != 'lshowcase-thumb'){
            unset($sizes[$key]);
        }
	*/
        if($type!='lshowcase'  &&  $value == 'lshowcase-thumb'){
            unset($sizes[$key]);
        }

    }
    return $sizes;
}