I have read recently about how even RAW images can have DNR and sharpening applied and I'm wondering, is this something some particular camera manufacturers are known to do or it's a universal thing ??
For people asking how a RAW file can have DNR applied:
"The “Star Eater” problem is a form of software spatial filtering designed to reduce noise in photos, particularly hot pixels. Unfortunately, the rather rudimentary filtering algorithm that Sony is using easily mistakes sharp pinpoint stars for noise, nearly deleting them from the image or greatly reducing their brightness. The result is an astrophoto with less stars and the appearance of diminished resolution. Sony a7RII, a7SII and a7RIII cameras exhibit this problem for all exposure times longer than 3.2″. Furthermore, the “Star Eater” issue affects RAW images (whether uncompressed or not) and cannot be disabled by any means. There are no user selectable settings that will prevent these cameras from eating stars."