It seems like you two agree on everything except what "device dependence" means...? GP acknowledged that there is no direct conversion between RGB and Lab, dist

It seems like you two agree on everything except what "device dependence" means...? GP acknowledged that there is no direct conversion between RGB and Lab, distinguished RGB from sRGB (implying the former is not a colour space), and indicated that a colour space like sRGB does solve the problem (since TFA is about using it to solve the problem).