Thanks for your answer Otto.
I did it, but it doesn't work :(, is only happening me with this template... What is wrong?
In header.php
<?php if (is_page_template('Imagenes')) echo('<meta name="robots" content="noindex,follow" />'); ?>
In image.php
<?php
/*
Template Name: Imagenes
*/
?>
I hope your help!
Ps: My hole <head> in header.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head profile="http://gmpg.org/xfn/11">
<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />
<title><?php if (is_archive()) { wp_title(' —',true,'right'); } else { wp_title('—',true,'right'); } ?><?php bloginfo('name'); ?></title>
<meta name="generator" content="WordPress <?php bloginfo('version'); ?>" /> <!-- leave this for stats -->
<?php if (is_page_template('Imagenes')) echo('<meta name="robots" content="noindex,follow" />'); ?>
<link rel="stylesheet" href="<?php bloginfo('stylesheet_url'); ?>" type="text/css" media="screen" />
<link rel="stylesheet" href="<?php bloginfo('template_url'); ?>/custom.css" type="text/css" media="screen" />
<!--[if lte IE 7]>
<link rel="stylesheet" type="text/css" href="<?php bloginfo('template_url'); ?>/ie7.css" media="screen" />
<![endif]-->
<!--[if lte IE 6]>
<link rel="stylesheet" type="text/css" href="<?php bloginfo('template_url'); ?>/ie6.css" media="screen" />
<![endif]-->
<link rel="icon" href="http://www.colegioyapeyu.edu.ar/favicon.ico" />
<link rel="shortcut icon" href="http://www.colegioyapeyu.edu.ar/favicon.ico" />
<link rel="alternate" type="application/rss+xml" title="<?php bloginfo('name'); ?> RSS Feed" href="<?php bloginfo('rss2_url'); ?>" />
<link rel="pingback" href="<?php bloginfo('pingback_url'); ?>" />
<?php wp_head(); ?>
<script type="text/javascript" src="<?php bloginfo('template_url'); ?>/js/jquery.js"></script>
<script type="text/javascript" src="<?php bloginfo('template_url'); ?>/js/cycle.js"></script>
</head>