QTR-Quadtone RIP

Howard Shaw wrote:

> 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

Where would the same 21 steps of the wedge land in print
density if that wedge goes through the profile first ?

There could be density tables made for several 
Dmax-Paperwhite ranges that way. Maybe just down to earth 
density ranges of certain papers and the Dmax possible on 
them with a given inkset as obtained in practice but I'm 
sure there are ways to create them more mathematically.

The linearised tables are nice for control when there's 
control on printer linearisation or one has to find out what
setup has the best linearised output if there's no control. 
Good to have control at say 85% of the job to get a printer 
in line but why not add what that last 15% does. I too have 
some difficulty in the way that perceptual tone separation 
is expressed in densities but if it works for the tables of 
a linearised tone range I do not see that it is worse for 
what shall we call it .......?
It may be more useful for some to have also tables that show 
the output after all steps as in many cases there's a black 
box in between, not in QTR of course.


-- 
Met vriendelijke groeten, Ernst


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