QTR-Quadtone RIP

Roy and Brian,

 

You’re freaking me out! I think I’m getting answers here to questions I didn’t even realise I should be asking. That would explain perfectly what I have been describing as strange relative table behaviour.

 

It all pivots on one very important question. 

 

Does selecting “printer manages colour” automatically assign sRGB to the file data (GG2.2 numbers) or initiate a conversion to sRGB?

 

Eugene

 

De : QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] 
Envoyé : July-30-16 10:36 PM
À : QuadtoneRIP@yahoogroups.com
Objet : [QuadtoneRIP] Re: QIDF versus ICC

 

  

It is my understanding that Adobe has changed the colour management in recent versions of Photoshop in a way that also affects Windows users.  This change is not that well known, and fortunately for this forum, it doesn't affect QTR printing on Windows.  

If you print direct from PS and select "printer manages colour" in the PS print dialog, then you will get a silent profile conversion to sRGB en route to the printer driver.  This behaviour is spelt out and defended by Adobe engineer Dave Polaschek in the comments section of this article on TOP:
http://theonlinephotographer.typepad.com/the_online_photographer/2015/10/photoshop-vs-printer-managed-color-printing.html

He also discusses the behaviour in OS X.  This is the only place I know where an Adobe engineer has discussed this issue publicly, although be warned you will need to read his comments (there are several comment blocks from him) many times to understand fully.

 

So on Windows, the people who are particularly affected are ABW users, and the users of certain RIPs that install as a printer driver, e.g. PrintFab, as these workflows use the "printer manages colour" setting.  The workarounds are either to assign to sRGB before printing, a clumsy workflow, or to do a null profile conversion in the print dialog, e.g. from AdobeRGB to AdobeRGB.  Photoshop shows a warning about this, but it still works on Windows.  Dave Polaschek warns that it may stop working one day.  

 

I've tested this.  I ABW printed and measured the 21x4 twice - once as it is supplied as an untagged greyscale image, and once after converting it to AdobeRGB and then assigning to sRGB.  They weren't the same.  The measurements of the untagged greyscale print were decidedly odd.  



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

Paul 

 

Thanks for the reference. 

 

SO I will assume that ... windows users are unaffected. 

 

 

De : QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] 
Envoyé : July-30-16 1:04 PM
À : QTR-Forum
Objet : Re: [QuadtoneRIP] Re: QIDF versus ICC

 

  

In Windows 7 I can print from Photoshop CC using "No Color Adjustment" in the Epson driver and inserting an ICC in the Photoshop Print screen.  See, for example, page 3 of http://www.paulroark.com/BW-Info/Glossy-Carbon-Variable-Tone.pdf.  

 

Likewise, I can use an ICC with ABW printing from PS CC in Windows 7.

 

I believe there was a past PS and/or Windows version that did impose constraints, but my current Windows 7, PS CC setup has the settings that I need for making and using ICCs without any work-around.