QTR-Quadtone RIP

Extremely helpful advice, as always. Thank you.

 

Mick

 

From: <QuadtoneRIP@yahoogroups.com> on behalf of "roy@... [QuadtoneRIP]" <QuadtoneRIP@yahoogroups.com>
Reply-To: <QuadtoneRIP@yahoogroups.com>
Date: Thursday, August 30, 2018 at 1:53 PM
To: <QuadtoneRIP@yahoogroups.com>
Subject: Re: [QuadtoneRIP] Re: Creating an icc profile with a densiometer.

 

  

 

---In QuadtoneRIP@yahoogroups.com, <forums@...> wrote :

>>>If you are ICC profiling ABW, print the gray-gamma 2.2 (or sRGB/AdobeRGB) target 

 

This is an example of where you can go wrong if you are not knowledgeable and careful.

The targets are supplied in general with "no icc tagging" -- the idea being you are not to

use any color management.  So if you change them in any way you must make sure not

the change the data values in the file. Assigning a profile is ok, but converting from grayscale

to RGB does do a convert -- you must to it in such a way that does not change the values.

A gray-gamma-2.2 to AdobeRGB is OK, but many are not.  You can and should always

look at the histogram in Photoshop.

 

But the best answer here is NOT to mess with the target -- use the original file.

A correct target and no-cm doesn't look at the tagging (nor gray vs RGB) anyway.

Print-Tool with No CM will handle it all just fine.  (Of course this is Mac only).

 

Roy

 

>>>with print-tool set to No Color Management and click the ABW button in print-tool (right next to the color management menu).