Jpegs viewed in the finder appear to be over saturated when viewed in the Finder/Quicklook whereas viewing the same jpeg file in Preview looks correct color wise and doesn't appear over saturated. I suspect the finder is not using the correct color profile but I'm not really if that's the reason is technically. In any event finder info seems to indicate it's using RGB for the color space instead of sRGB which Preview appears to use. In any event my Nikon jpegs looked like there were shot in vivid in Mojave but look fine in prior versions of MacOS.