– Jpegs have any previous edits baked-in and are (lossy) compressed, hence the smaller file size.
– Raw files are exactly that, just raw data and do not contain any edits by design, no matter what you set in your camera. They contain all available sensor data which gives more room for editing like highlihgt/shadow recovery, tone compression etc. but it also means a large file size.
Every app (including camera software) renders raw files slightly differently. That’s why the raw and jpeg pairs look different once you put the raw file in editing mode, even if you don’t apply any in-camera edits to the jpeg.
When you edit the jpeg in Nitro, you edit “on top” of camera’s baked-in render and edits which you camera has applied.
When you edit the raw file, you start at the raw level without any previous edits. You basically replace the camera’s “raw developmenet” with your own.
