QTR-Quadtone RIP

Kip Cole wrote:
> I have finally been able to dedicate my old 2100 to QTR and am
> starting with standard UC until I get comfortable with curve creation
> in a "2k" system.
> 
> I am trying to create a warm curve for HPR.  I have tried as a base
> curve the EEM curve in the QTR distribution and also Mr. Schofields
> HPR curve at
> http://homepage.mac.com/WebObjects/FileSharing.woa/wa/default?user=scho&templatefn=FileSharing2.html&xmlfn=TKDocument.2.xml&sitefn=RootSite.xml&aff=consumer&cty=US&lang=en
> I am creating step wedges of non-linearised curves in all cases.
> 
> For all my tests I'm getting density reversal in the 100% step (using
> the 21step.tif file).  I'm getting around 19.1 to 20.2 L* in this step
> depending on my adjustments, and a good ramp from around 18.5 L* on
> the other steps.  All measured with EyeOne/MeasureTool.
> 
> Have tried adjusting black boost, gray overlap (even up to 100%),
> shadow adjustment but to no avail - the 100 step is always lower
> density. The curve uses only Mk and Lk as you would expect.
> 
> I know this is a little trial and error involved but after about 20
> experimental step wedges I figure some advice and guidance would sure
> be appreciated,
> 

Kip

I would suspect the ink limit on K. What are the readings for K on the 
calibration strip for the limit you have used and the two steps either 
side? Sometimes it's worth pulling the limit a little back from the 
maximum dmax step to make sure you have good separation between the step 
at the limit and the step before it. The maximum can then be 
re-introduced via black boost.

You could also try an overlap of 0 if you haven't tried that yet.

Howard