QTR-Quadtone RIP

One thing I forgot in my previous post - too little coffee, I guess - is that you will need to 
conceptually keep clear the difference between print % ink and negative % ink, since they 
are opposites. I will clarify my previous post this evening, but I think you can grasp that a 
high negative ink density will produce a low print density and vice versa. So it is necessary 
to correct  the ink % that the printer is laying down for the negative - not a print like the 
normal QTR process...

--- In QuadtoneRIP@yahoogroups.com, "spsguru" <spsguru@...> wrote:
>
> Hi everyone
> 
> Like many I am trying to create digital negatives using QTR on a 3800.
> Well I am 22 test prints down the road and not able to get the control
> I need. I get either print highlights good and blocked up shadows or
> vise versa. Using the usual tools (gamma, shadow, highlight)only make
> it worse.
> Curves have also been unsuccessful using the method described in Ron
> Reeder's - which is a GREAT resource I have just not been successful.
> 
> so I went to try and linearize. 
> 
> I read 21 steps with an xrite 810. and entered those readings into the
> linearization line. Still no success. It ended up blocking up the
> highlights and shadows with thinning out of the midtones.
> 
> Yet I feel like if I knew how to control the values in the linearize
> line that would yield ultimate control of the ink densities.
> 
> So here are my questions - 
> 
> 1. I have so many negatives now that I can read the value I want via
> UV so I know exactly what the negative value should be for each
> printed value.
> ---Is there a way to use linearize to get a specific ink output for
> each value? In other words - I I know that I need UV of 1.5 for a 50%
> grey - can I get use a value in linear to lay down ink for 1.5 at 50%?
> 
> 2. I entered in the values as read by reflection densitometer into the
> linearize curve - but the output was no where near linear - can
> someone explain what linearize is really doing so maybe I can figure
> out what direction to tweak the values to make the curve move correctly.
> 
> thank you for any help
> Sean
>