What does linear RGB mean ?

[ggbutcher (Glenn Butcher)]

I spent the evening using dcamprof to make a SSF camera profile for my Nikon D7000. JSON… what fun. Anyway, here’s an image with extreme blues, the only color transform is SSF-camera → sRGB:

Same image, same processing, only difference was the camera profile was the D65 camconst.json primaries from RawTherapee:

Edit: The SSF profile has, instead of the 3x3 matrix, an AtoB0 LUT…