QTR-Quadtone RIP

Sean,


What Michael said. He knows this stuff better than anyone, I think.

I didn't realize that what you are attempting to do is use the 
linearization approach like you would for prints. As he said, you 
have to keep straight what you are trying to linearize - and that is 
you are trying to match a specific %gray on screen to the same %gray 
on the final print. The negative is the go-between, and the it is 
essentially 'backwards' from the print. More negative density equates 
to less print density and vice-versa. So if your print is too dark at 
a specific density on screen, you need to ADD density to the negative.

It is not that easy, but once done, gives beautiful results.

I'm sorry I forgot to put that essential piece of information in my 
original post, but except for that, it does describe the basic steps 
you will need to go through. 

Clay


--- In QuadtoneRIP@yahoogroups.com, Michael Mutmansky <michael@...> 
wrote:
>
> Sean,
> 
> And in response to your initial questions, you cannot do anything 
linear.
> Nothing in this process acts in a truly linear fashion. In my 
experience.
> That's why you'll have to do some testing and a bit of iteration.
> 
> You cannot use the linearize function to produce a resultant UV 
density
> except through a back-door approach of testing, and then taking the 
results
> and applying them to the file as an adjustment curve.  That will 
get you
> pretty close, though.
> 
> You can't use the reflected density values directly.  You need to 
go through
> the inversions and the Y-N formula to produce an adjustment curve 
that will
> properly linearize the negative.
> 
> 
> ---Michael
>