Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Anthony 
Atkielski" <anthony@a...> wrote:
> Peter writes:
> 
> > But that's just as artificial as the single-wavelength
> > LED example I used.
> 
> It is a simplified illustration.
> 
> > You have not demonstrated this has any bearing
> > on the real world problem of mapping color film
> > to black and white.
> 
> I've tried to explain this in as many ways as I can. 

All I asked for was a real-world empirical example, not a 
gedankenexperiment.  Why can't you name a specific wavelength that 
is picked up with a certain density on some black and white film, 
but "falls in between" two colors on some color film in such a way 
that if converted to b+w it would look different?