ReShade presets for FiveM and GTA V. A preset is a client-side post-processing configuration: it changes what one player sees on their own machine and nothing else. It is not installed on a server, cannot be required of players, and does not affect anyone who does not choose to run it.
A preset is written against a specific ReShade version and a specific set of shader files, so installing one without its matching shaders is the usual reason a preset loads but looks nothing like its screenshots. Presets also cost frame rate, sometimes heavily, and they interact with whatever graphics mod you already run — a preset tuned for NaturalVision will look wrong on vanilla lighting. Keep a copy of your working configuration before replacing it, and expect to adjust rather than match a screenshot exactly, since results depend on your display and GPU.
For a broader client-side graphics overhaul, compare the QuantV graphics mod and its ENB presets. Review its installation requirements and your server's client-mod rules before buying.