In Up (2009), before Carl finds out about the photos Ellie put in the adventure book, the

The.....light turned on?

https://www.reddit.com/r/MovieDetails/comments/c2hqvs/in_up_2009_before_carl_finds_out_about_the_photos/

In Up (2009), before Carl finds out about the photos Ellie put in the adventure book, the colors around him appear bland and cold. They are much brighter and warmer afterwards, signifying his feelings.