CMYK values different from displayed colour

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  • Updated 2 years ago
I'm using Photoshop CC 2015.2
Monitor (Eizo Colour Edge) is calibrated
(tested on different monitors/computers/PS CC accounts)
I created a Photoshop document (Adobe RGB) and converted it to CMYK (ISO Coated v2 300 % (ECI))
An area filled with one colour stayed more or less the same (common changes when converting from Adobe RGB to CMYK) . It is a light Blue (R 121 G 199 B 222) (C 64 M 0 Y 17 K 0)
But the final product (CMYK print) is much more different from what I used to have in Photoshop. Blue became green.
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Konstantin Saoburny

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Posted 2 years ago

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Konstantin Saoburny

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After some research I found a chart which shows the colours after entering the CMYK/RGB values. If I enter the CMYK values (C 64 M 0 Y 17 K 0) it shows the colour which is similar to the colour of the print: green (R 92 G 255 B 212<- I am adding the RGB values so you can recreate my problem because the CMYK values stay the same.
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Konstantin Saoburny

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You can find the colour-chart here
http://www.farbtabelle.at/farben-umre...
Of course this chart isn't pertinent for any colours but other charts have the same result and I had the same problem with two different print shops.
I don't need the blue exactly like the values. But the blue shouldn't become some kind of green.
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Konstantin Saoburny

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Maybe someone has/had the same problem and knows a solution and/or knows what causes this problem? Can someone confirm the (C 64 M 0 Y 17 K 0) (without any online charts) as mostly green and not blue.
I already asked Adobe support but they couldn't say anything because they can't guarantee the correctness of the colour values as shown in online-charts.
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Chris Cox

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The actual appearance of the color numbers depends highly on the color profile used. And the color profile used for CMYK should depend on the actual printing conditions used (what printer, what paper, what inks, etc.).

What are you printing to/with?
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Konstantin Saoburny

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thank you! So it is possible that the big difference in colours as described above, results from a different interpretation of the cmyk colours by the chart. I can't find any information about the colour profile used on these websites, so this may cause the difference.
Unfortunately, I can't define the printing conditions without further research because I send my print files to a print-shop online. The print is a double-sided flyer. The colour profile used is ISO Coated v2 300 % (ECI), as recommended by the print-shop. I spoke with the costumer-service and they couldn't find any solution either. The colour settings and the colour profile are correct und used correctly. So I decided to order a smaller amount of prints to get a better basis of discussion. I wanted to avoid that but I think this step is necessary now.
I will post the results.
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Konstantin Saoburny

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The prints arrived and everything looks fine! Thank you, Chris Cox! It appears that those CMYK-charts really use a much more different profile than I do.
I found a book called "handinhandbuch" (german) which contains many CMYK charts on different types of paper. For me it is very useful to get a feel for printed CMYK colours. Of course it cannot be used for the exact colours, as Chris Cox said, but it is much better than the online charts. ;-)