Here's a rundown of the various Protune options that are available on the HERO6 Black and what each of them does.
Some GoPros, like the HERO5 Black, offer a choice between two color modes in the photo mode: GoPro and Flat. Here are some examples and when they're best used.
Some GoPro models give you the option to choose between high, medium, and low levels of sharpening. Here are some examples to help demystify what these different settings do.