I've got a Lightroom library containing only raw files. Some of them are b&w tiff scans or b&w dng files (that I converted from tiff).
Now simple task: Search my library for just b&w (black and white) photos.
Of course, there is Metadata filter with Treatment column. The problem is, my b&w tiffs/dngs are already b&w, so it's not possible to "treat" them b&w - in Development module treatment switch is greyed out. So Treatment type for them is "Color" - as for all other raw files. Any hints? how can I filter my b&w scans from color ones?