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Final color toning/grading in CMYK

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  #21  
Old 06-26-2012, 10:27 AM
Shoku Shoku is offline
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Re: Final color toning/grading in CMYK

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Originally Posted by andrewrodney View Post
You might want to rethink that sentence! It is simplistic and factually incorrect.
This discussion has devolved into a debate about words.

Reality:
RGB is a color space based on light.

CMY are the reflective primaries used in CMYK printing and other reflective based color spaces that put ink on paper, or other physical material that reflects light and produces color.

Not understanding the CMYK process is a limitation that can come back and bite you. We see it all the time in files sent to us by Pro Photographers who only work in RGB on their computer. 90% of the time we must retouch their files to reproduce what they are expecting. The 10% who are successful without any additional work understand CMYK, and have made the proper adjustments.

Last edited by Shoku; 06-26-2012 at 01:52 PM.
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  #22  
Old 06-26-2012, 06:05 PM
Shoku Shoku is offline
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Re: Final color toning/grading in CMYK

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Originally Posted by andrewrodney View Post
When Mac gleefully moved that into storage and started using Epson printers instead, he didn’t need to know squat about CMYK. He did have to know how to handle RGB data going off to a driver that simply doesn’t understand, nor should be sent CMYK data.
That is interesting. We use an Epson 9600 and send our files to the RIP already converted to our CMYK output space. The Rip then converts that to the Epson output profile, the same way it would an RGB file, and the result is excellent.
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  #23  
Old 06-26-2012, 06:15 PM
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andrewrodney andrewrodney is offline
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Re: Final color toning/grading in CMYK

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Originally Posted by Shoku View Post
That is interesting. We use an Epson 9600 and send our files to the RIP already converted to our CMYK output space. The Rip then converts that to the Epson output profile, the same way it would an RGB file, and the result is excellent.
The only reason to send such a printer CMYK data (and bypassing the native driver to do so) is for cross simulating another, CMYK process (proofing: Make my Epson match a press sheet). Otherwise you severely reduce the native color gamut of the inks and this device.
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  #24  
Old 06-26-2012, 06:31 PM
Shoku Shoku is offline
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Re: Final color toning/grading in CMYK

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Originally Posted by andrewrodney View Post
The only reason to send such a printer CMYK data (and bypassing the native driver to do so) is for cross simulating another, CMYK process (proofing: Make my Epson match a press sheet). Otherwise you severely reduce the native color gamut of the inks and this device.
Yes, you are correct. That is the very reason many Photographers have problems with off-set printing - they fail to identify problem files because they are RGB centric. I love the wide gamut possible on modern ink-jet printers, but expecting that on a CMYK offset press, whether analog or digital, is opening the door to disappointment. But it is possible to send CMYK data to an inkjet and get good results - RGB is not absolutely necessary.
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Old 06-26-2012, 06:51 PM
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andrewrodney andrewrodney is offline
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Re: Final color toning/grading in CMYK

If you have the CMYK output profile, even with an RGB centric workflow and driver, you can still produce a pretty good simulation. Convert RGB to CMYK. Then convert CMYK back the final RGB output space using an Absolute colorimetric intent. Photoshop’s Print command makes that easy once you setup a customize soft proof. Then in Print, you use the Proof option where you can essentially do a three way conversion (Adobe RGB (1998)>CMYK>Epson output profile).
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