My editing programme has an "auto levels" facility. I use it rarely, because it often throws up some strange results. Sometimes, though, they can be quite interesting! Such as this:
Yesterday evening the sky turned very dark and grey, though the storm which seemed to threaten never materialised. You couldn't see much of the sunset, but the bit that did show was quite dramatic, with orange beams of light shining upwards.
Playing with the auto levels gave this result:
Hmm. Backgrounds for cards, maybe.......?