QTR-Quadtone RIP

Howard,

Thank you for the reply. Loading up an existing curve along with your
explaination helped alot. 

Since the existing curve had values so close to what I measured I
decided to use it as is except clear the linearization values and
relinearize. 

I printed the 21 step wedge and measured the values with my spectro.
Oddly the 100% patch only read a density of 1.603 where the 100% black
patch from the calibration/separation page reads 1.701. That is a big
difference but I figured that linearizing would fix it.

After linearizing the 21 step target has beautiful separation all the
way through and looks very good. Except... the 100% black patch still
measures 1.61. This does not seem near what this paper/ink combo can
achieve (UT2 on Innova Fiba-Print) since I measured over 1.7 on the
separation page. The ink limit is set to 70% and the black boost is 100. 

Is this normal? Should I expect to be able to get a DMax of 1.7???

Thanks.

Scott

--- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@b...> wrote:
>
> Scott
> 
> The general idea would be to make two curves - one using K (black), C & 
> LC for a cool(bluish) tone curve and the other using K, M & LM for a 
> warm tone curve. You can then use qtr's ability to blend two curves at 
> print time to produce the degree of warmth/coolness you favour.
> 
> The yellow position ink is for a sepia tone and is used generally as a 
> toner ink.
> 
> There should be other examples of curves designed for either UT2 or UT7 
> that you can look at (see for example the UT7 curves for the 2200). 
> Remember though that the UT7 curves have the warm & cool inks round the 
> other way (ie cool in M/LM, warm in C/LC).
> 
> Howard
> 
> 
> None wrote:
> > I am using an Epson 1280 with UT2 inks. I am following the user's
> > guide for creating curves and it says I need to find the relative
> > densities of all the black/gray inks in order from darkest to
lightest.
> > 
> > Which inks do you use for this? The cyan position has a bluish ink
> > that I suspect is considered a toner ink as does the light cyan. The
> > yellow position has yellow ink which I expect is also a toner. Do I
> > use Black, Magenta, Light Magenta in that order as my Black/Gray inks
> > and consider the others as toners?
> > 
> > I would very much appreciate any direction on this.
> > 
> > Thank you.
> > 
> > Scott
> >
>