Redirect all URLs ending in .jpg to Attachment Page?

It seems like there should be a simple, one- or two-line chuck of code to redirect all URLs ending in .jpg and .png to the correlating Attachment page, but I sure can’t find it.

It’s a photography website, and I want people to see the Attachment pages; just not the raw .jpg File URL page. I *don’t* want to forward to the post or page to which a Media item may be attached.

Any help will be greatly appreciated!