QTR-Quadtone RIP

Roy,

The post-linearization measurement is of the 21-step target, and I'm printing
it with color management off. 

Am I supposed to turn it on after linearization? And if so, how do I select
an appropriate ICC profile?

--Daniel

--- In QuadtoneRIP@yahoogroups.com, "Roy Harrington" <roy@...> wrote:
>
> Hi Daniel,
> 
> 100% black should stay 100% black in the output.   The most likely reasons for
> this not working correctly is the Rendering Intent and Black Point Compensation.
> In Photoshop it definitely has to be Perceptual Intent and BPC=On.  Relative
> Colormetric often gives reduced dMax.  On Mac's it's simply on the
> Print with Preview
> page.  But if you use Convert-to-Profile check there as well.  Default
> is often set
> at Relative.  If you are on a PC and use other editing programs --
> Qimage in particular -
> it's important to see how it works.
> 
> Ernst just mentioned some issues with Qimage so see that thread as well.
> 
> Roy
> 
> 
> On 6/18/07, Daniel Jackson <dnj@...> wrote:
> > I'm trying to create a simple QTR curve. When I linearize it, I do
> > indeed get a much straighter luminance curve, but the dmax at
> > 100% drops dramatically: when plotted in Excel, the curve
> > noticeably tips upwards between 95 and 100, reducing the
> > dmax from 1.62 pre-linearization to 1.53 after.
> >
> > Why is this happening and how do I fix it?
> >
> > --Daniel
> > PS. Gray overlap is set to zero, so I don't think it's related to the
> > second ink curve being changed.
> >
> >
>