Those of you who have worked on WordPress for quite some time know too well about the problem that attachment pages pose, especially towards your SEO efforts. Google has gone out of its way to punish sites that have thin content pages. Your attachment pages, which include only your photos and a title, are not exactly thick content pages. In order to avoid getting in trouble with Google and other search engines over these pages, you should redirect them to their associated posts. Robots Meta is a powerful plugin that offers just that.
Robots Meta is the ultimate plugin to manage your meta tags with. It lets you no-follow or de-index certain parts of your website to increase your site’s chances of ranking higher in top search engines such as Google. You could always redirect your attachment pages by writing redirect directives. Why do that when Robots Meta handles that and much more. To make your site more Panda proof, just check “Redirect attachment URL’s to parent post URL.”
Robots Meta has plenty of other options. You do want to be careful which sections of your website you decide to “nofollow.” If you have plenty of attachment pages that are sitting on your server and getting indexed by Google, Robots Meta can fix that issue for you with a click of a button.