A couple of weeks ago I messed about with my Fuji X-T30 camera so that it appeared to create images in mono (I now have no precise memory of what I did). Now, under Windows one image on the film roll shows in monochrome in lighttable but in colour when viewed in darkroom. The rest of the filmroll appears in colour in lighttable. Under Linux it shows in colour in either both lighttable and darkroom (and, yes, the image and xmp files are identical at the binary level for the 2 OSes).
What causes this behaviour (aside from operator error, that is)?
Strangely, under Windows, when viewed using the Photos app. this one image initially appears in mono (I presume from the embedded thumbnail) and after a second or so it displays at a different size and rotation, in full colour (presumably using the raw data). The whole film roll appears in mono when viewed with Faststone under windows or with XnView under Linux.