QTR-Quadtone RIP

Hi Amadou,

You have exactly the right idea for all these setups.  I have a few 
comments though.

I'd recommend using the 21x4 step target rather than 51 step.
You get 4 patches of each step that are averaged for a more accurate 
measurement.
Also 21 steps probably gives a smoother overall curve since there are 
less points.

Note that the ICC created can be used for both printing and 
soft-proofing.  Standard
ICC usage is to print with the ICC profile -- this may involve explicit 
Convert-to-Profile
if your print workflow does not have printing profiles builtin.  
Soft-proofing can work
two ways.   The "Preserve Color Numbers" determines whether the proof 
is for printing
with or without the print profile.  If you are printing WITH the 
profile then PCN should be
OFF.  If you print WITHOUT the profile then PCN should be ON.  Its very 
important that
you soft-proof based on how you are going to print.

If you make all 3 ICC profiles and print using the profiles and 
corresponding drivers,
you ought to get a very close match as far as luminosity.  Hue is of 
course dependent
on the inks and driver settings you've used in each case.  (note that 
each ICC profile
is for a specific set of driver settings.  E.g if you change hue in 
Epson ABW you ought to
be creating separate icc profiles.)

Roy

On Wednesday, September 13, 2006, at 06:59  AM, Amadou Diallo wrote:

> I want to make sure I've got the QTR profile logic straight.
> I have a 9600 running Piezotones with a RIP, a 2400 with OEM inks and 
> an R800 with an
> NK7 split tone. If I am satisfied with calibration and linearization 
> on all 3 devices can I
> print the 51 step target through the RIP (StudioPrint) with my normal 
> print settings, read
> patches with the Eye One and Measure Tool and create an ICC profile 
> that will accurately
> softproof my RIP output?
>
> On the 2400 I have built a color profile with Eye One Match. If I 
> print the 51 step target
> using ABW mode with the color printer profile, I can read patches with 
> the Eye One and
> Measure Tool and create an ICC profile that will accurately softproof 
> the Epson ABW driver
> output?
>
> On the NK7 setup, I understand (I think) that the linearizations are 
> wrapped in IJM's
> proprietary profile. So I can print the 51 step target using my normal 
> QTR print settings
> then read patches with the Eye One and Measure Tool and create an ICC 
> profile that will
> accurately softproof my QTR output?
>
> So all I'm really trying to accomplish is to characterise my current 
> output for softproofing.
> Do the above steps achieve this? THanks.
>
> amadou diallo
> www.diallophotography.com
>
>
-
Roy Harrington
roy@...
Black & White Photo Gallery
http://www.harrington.com