Digital BW, The Print

Florian

First I assume you asking about how to use QTR create ICC and not how to use
QTR - the RIP - itself and creating your own ink curves.

Think of QTR's ICC profiling feature in exactly the same way as the colour
management workflow you are used to.  The idea is to print a patch target
without colour management but using the driver settings that you want to
profile, read the target and then drop that measurement data into QTR Create
ICC.  (With a package like PM5 these last two steps are just done together.)
Because you are profiling "greyscale" output you print a greyscale target,
or "step wedge" - the QTR download has a 51 step wedge which is used for
this process.  So you open this step wedge in PS or whatever application you
use in your workflow.  It is an untagged document and you want to Do Not
Color Management This Document (or whatever the exact wording is that PS
uses).  Print the step wedge/target with the driver and settings you wish to
profile - without colour management just like doing  colour profile.  If,
for example, you want to profile a particular QTR ink curve (or curve
combination...eg 50% warm/cold) then you'd print this target from PS with No
Color Management and then select the appropriate curve and other settings in
QTR.  You might also want to profile Epson's Adv B&W if you have a K3
printer in which case you'd select the Epson driver (still with No Color
Management out of PS), Adv B&W and the particular Epson Adv B&W settings you
want to profile.  So the target is a set of stimulus and you are going to
measure the printed output, ie the response of the particular
printer/driver/settings.  Take the printed target and measure it with
MeasureTool For each target there is a reference text file and you need to
select this reference file in MT so that it knows the nature of the target
you are going to measure.  Once you have the measurement data saved as a
text file, simply drag and drop this file onto the QTR Create ICC Profile
application.  You'll get an ICC profile and a useful information file in the
folder from which you'd dragged the original measurement data.  The ICC
profile is used in the normal fashion.  You can set up a proof with it in
PS.  When you print an image you Let Photoshop Determine Colors and use this
ICC profile and the Perceptual Intent with BPC, much in the same way as yoou
would with a colour image.  Obviously the profile is only relevant for the
particular settings (driver - QTR or Adv B&W - and settings/ink curves) you
used to print the target.  If you want to print an image with different
settings or curves you need to use a profile made with those other
settings/curves.

Your images do not need to be in the GG2.2 space - in fact, the whole point
is that the profile and CMM do the conversion from any space to the print
space (as "captured" by your stimulus-response measurements that have been
encapsulated in the profile you made).

Steve




> From: john dean <deanwork2003@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Sat, 15 Apr 2006 21:36:49 -0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: [Digital BW] QTR Calibration
> 
> What you do, is to assign the file grey gamma 2.2, print the grey
> target using QTR as your print driver which is being hosted by Photoshop.
> 
> When you get to the curve interface of QTR to set your curves, assign
> no curves, under Modes set to QuadTone RIP Calibration.
> 
> Now all this functions a little differently depending on the inkset
> used, for final output because different inksets were designed for
> different grey spaces. For instance with the 9600 and Ultrachomre I
> use gg 2.2 as source space while with Cone NK6 I use greymatte paper
> space as a tagged space. I suspect that when you select QTR
> Calibration Mode this is converting everything to LAB space anyway but
> I am not sure about that. You need to read all the info included in
> the  ICC Create folder. If you still have problems the place to ask
> for specific info is the yahoo QTR List.
> http://groups.yahoo.com/group/QuadtoneRIP/. Join it today.
> 
> John 
> 
> 
> 
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com,
> "roschko_leolevin" <g.flo@...> wrote:
>> 
>> Hi, 
>> 
>> I am a newbie wit B&W Printing and QTR. I know how to use
>> Colormanagement and Softproof and so on ...
>> But in B&W are things different.
>> Now I try to make a icc Profile with Profilemaker 5 and my Eye-one.
>> There is the Manual in the Eye-one Folder after installing QTR, but
>> there is nothing about printing the Test Charts.
>> Where do you print this Charts ?
>> Photoshop ?
>> which Settings do you use ?
>> 
>> thank´s for your answer
>> 
>> Florian