QTR-Quadtone RIP

Ernst Dinkla wrote:
 >>> ...
>>> the profile refinements became available so it is understandable. Adding
>>> numbers for perceptually correct density ranges and calling them Ideal
>>> curves would help to show the difference and add another control for
>>> users. Is this correct or did I miss updates of the manual ?
>> 
>> Here, I think you are suggesting that there be another table (or set of
>> columns) that provide "perceptually correct density values". Do I understand
>> this correctly? If so, what are perceptually correct density ranges and how
>> are they determined?
> 
> There's a chapter:
> 
> Profiling the Advanced Black and White Mode
> 
> on this page
> 
> http://www.outbackphoto.com/printinginsights/pi045/essay.html
> 
> that I thought sums up the linearisation stage above and the 
> next step the profiling on top of it.
> 

I'm none the wiser. I can see the profiling step described on that page 
(for use with Epson's ABW mode) but not a table of "perceptually correct 
density values". Could anyone explain further please or, better still, 
provide the table?

Howard