Isn't that same as a jpeg then?
Edit: There are some parameters:
> FilmKit communicates PTP (Picture Transfer Protocol) over USB, the same protocol that X RAW STUDIO uses. The camera does all the heavy lifting: it receives the RAF file and conversion parameters, processes them, and returns a JPEG.
More like a WebGUI for your camera.
>Isn't that same as a jpeg then?
Yeah, but Fuji X cameras are renown for their JPG processing so many people want the in-camera JPG. You could shoot directly to JPG but with an app like that you can later change the JPG profile, etc. while adjusting exposure parameters.