CMYK vs RGB RE: PDF query

[Jacob Schäffer (Grafikhuset)]

It’s definitely NOT easy to explain this. Color conversions are COMPLEX. Anyway, RGB -> CMYK conversion is lossy, and CMYK -> RGB is also lossy.

 

What is the point of the RGB switch afterall? Why not just pass through what’s input and remove this switch?

 

Best regards / Med venlig hilsen

Jacob Schäffer  |  Chief Developer

  _____  



Grafikhuset (House of Graphics)
Paradis Allé 22, Ramløse
DK-3200 Helsinge, Denmark

Mobile: +45 2021 1958
Phone: +45 4848 0096
Email:  <mailto:js at grafikhuset.dk> js at grafikhuset.dk
Web:  <http://design.grafikhuset.dk/> http://design.grafikhuset.dk

 

From: framers-bounces at lists.frameusers.com [mailto:framers-bounces at lists.frameusers.com] On Behalf Of Heiko Haida
Sent: 20. oktober 2014 16:22
To: Craig Ede
Cc: framers
Subject: RE: CMYK vs RGB RE: PDF query

 

Well, Craig,

thats easy to explain: 
When I use Illustrator or Indesign, a colour will not change its screen representation if I switch from CMYK definition to RGB definition. That is not a miracle or a question of "who knows" (these programs use HSB definitions, and obviously the conversion works very well).
With FrameMaker, on the other hand, a CMYK colour will not look "right" neither on screen nor in the resulting PDF. 
And only with the CMYK print option activated that has been implemented successfully with FM 10, this colour information will be transfered to the PDF correctly.

Best regards - Tino H. Haida, Berlin

 

Craig Ede:

Given the theoretical differences I'm not sure why you would expect RGB output of CMYK colors to be close to what CMYK color should looks like. 
 
Think of it this way, if you choose a Pantone color as a spot color, you'd expect it to print exactly like as that Pantone color to paper. But to the screen, who knows? It's be "close" but depends on the color correctness of the particular monitor.
 
Craig
 

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