QTR-Quadtone RIP

Isn't "no color management" a function of the printer, such as Epson's?

If I am confused, please point me in the right direction. Thanks for your
help. Joachim

From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
Behalf Of Roy Harrington
Sent: Friday, January 29, 2010 2:17 PM
To: QuadtoneRIP@yahoogroups.com
Subject: Re: [QuadtoneRIP] Re: StepWedge tool -- help needed

 

  

In CS4 the "no color management" selection is broken. So to get the same
result you need to leave the file as "untagged", and print with
photoshop manages
color and the print profile set to the working space. For calibration mode
use
the RGB working space and for the regular Gray stepwedges use the gray
working space.
(the idea here is to match the mode of the file).

Roy

On Fri, Jan 29, 2010 at 10:14 AM, jespes <jesse@...
<mailto:jesse%40jessepesta.com> > wrote:
> Question: Does the StepWedge tool require me to print the 21-step target
untagged with no color management?
>
> If so, how do I do that on CS4 on a Mac, which doesn't allow me to select
"no color management" in the print dialog box. Or am I misunderstanding
something?
>
>
> I ask this question after noticing the following passage in the
"Eye-One-ReadMe.pdf" file:
>
> Printing the Target Stepwedge Image
> Print targets with QTR and all the selections you want to profile or
linearize. The intended resolution is very important. The targets are
Untagged and should NOT be color managed in any way. Do not Convert an
image. Always print with No Color Management or Same As Source.
>
>
> thanks,
> JP
>
>
>
>
> --- In QuadtoneRIP@yahoogroups.com <mailto:QuadtoneRIP%40yahoogroups.com>
, "jespes" <jesse@...> wrote:
>>
>>
>> I'm trying Roy's new StepWedge tool and running into obstacles. I am a
newbie at curves and and would be very appreciative if someone could look at
what I'm doing and offer any advice.
>>
>> The setup: Snow Leopard Mac, Photoshop CS4. I don't have access to a
densitometer or spectrophotometer. The printer is an Epson 7000 with K6
inks. Printer works fine. (Good nozzle checks etc.)
>>
>> QTR's stock K6 curves for the 7000 get me close, but with one major
problem: They're not giving a smooth transition through the midtones.
Instead, the midtones stay too dark, then fall off sharply around 30%-40%.
>>
>> When I try to modify the QTR profile following the instructions with the
StepWedge tool, do I get a smoother transition, but overall a MUCH, MUCH
DARKER result.
>>
>> I've tried the StepWedge tool several times. Here's the basic approach.
Can you spot my mistake(s)?:
>>
>> (1) I do a nozzle check on the printer to confirm all is well.
>> (2) Open the the "Step-21-gray.tif" in CS4.
>> (3) Since CS4 on the Mac won't let you print with "no color management,"
I assign the tif a profile. I've tried several profiles, including "QTR-Gray
Lab."
>> (4) Print the tif on Epson Enhanced Matte, using the standard QTR profile
for EAM paper for the 7000. (Printer settings: 1400, unidirectional.)
>> (5) Using a Canon Lide 200 flatbed scanner, I scan the printout of the
tif alongside a standard Kodak Q13 grayscale card. (The Q13 is new.)
>> (6) Open the resulting side-by-side scan in CS4, and run the StepWedge
tool per instructions.
>> (7) Drop the resulting text file on to the "QTR-Linearize-Data" script,
which produces a new text file containing lots of data that I don't
understand, as well as a "linearize" line that looks roughly like this:
>>
>> LINEARIZE="94.92 90.66 87.27 84.02 80.6 76.01 68.1 61.28 56.8 53.91 50.88
46.88 43.74 41.07 38.64 35.45 30.91 26.4 22.96 19.94 18.47"
>>
>> (8) In my QTR folder, I create a new profile by making a copy of QTR's
standard EAM profile for the 7000.
>> (9) I open that copy, replace the "LINEARIZE" line in it with my newly
created "LINEARIZE" line, and then save and close my new profile.
>> (10) Then, I run the QTR 7000 install script. (This makes my newly
created profile show up properly in my printer-dialogue box).
>>
>> Lastly, I make a test print with my newly created profile and the test
print is very, very dark.
>>
>> Whew. That was a lot of words. Does any of that make sense? Do you see
any obvious problems in my process?
>>
>> Many thanks to all for any advice. I feel like I'm very close with this
printer....
>>
>> All the best,
>> JP
>>
>>
>
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