Is it possible to brighten a photo on an iPhone 3Gs after it's taken?

[thargraves]

I was going out onto my back patio tonight and saw a huge owl sitting on the top of the fence. My phone was in my pocket, so I snapped a couple photos, knowing my husband wouldn't believe me if he didn't see it. It was dark outside and I only had a patio light on, so you can't see it in the photo at all. Is there a way I can lighten it to be able to see the owl in the photo? Thank you in advance for any help!