There are a lot of steps like that provided you want an image that you want to show to the user (i.e. Jpeg). You do have somehow merge the 3 Bayer filter detections on rectangular grid, which involves interpolation. You do have to subtract some sort of bias in a detector, possibly correct for different sensitivity across the detector. You have to map the raw 'electron counts' into Jpeg scale which involves another set of decisions/image processing steps