If you follow some people who play Final Fantasy XIV on Twitter you might have seem some amazing screenshots accompanied with the tags of #Reshade or #GShade.
If you are wondering what they are, it is basically like this: Reshade is a program that applies some post-processing effects to whatever appears in your screen and as far as I know it is used only with games. You can find some presets for different games here.
GShade is a modified version of Reshade made by a group of Final Fantasy XIV screenshot aficionados called GPosers. Besides some technical changes that I honestly don't understand, GShade also comes packaged with a bunch of community presets for use with Final Fantasy XIV. They don't have an official site (that I know of) but you can find the latest version of it by following their twitter account or joining their Discord server.