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I have a cmyk colour of 0,40,50,0

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I want to change the magenta value, the 40%, to redder colour 0,67,70,28

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And see what the resulting CMYK colour is. How I can go about doing this?

closed as unclear what you're asking by Scott, Lucian, Billy Kerr, Luciano, Paolo Gibellini Jan 11 '18 at 13:54

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • Well.. you can't ever print more than 100% of a color. – Scott Jan 10 '18 at 17:22
  • So... are you saying that you want to substitute the Magenta ink for a specific red colour? – Digital Lightcraft Jan 10 '18 at 17:42
  • Your answer would be 0,67,70,28. Unless you are picking a red from a RGB color space and converting to CMYK you already know your answer. Unless you are trying to ask something else? – Ovaryraptor Jan 10 '18 at 17:42
  • I believe you are saying you want to print like this (0(C), 40(0,67,70,28), 50(Y), 0(K)) What color this creates I do not know. – John Burgess Jan 10 '18 at 20:47
  • can you edit your question and rephrase it to be more clear? – Luciano Jan 11 '18 at 10:14
2

A) You can't create a CMYk color where any value is above 100%. There's no feasible way to mix your CMYk starting point with another CMYK color in terms of press ink. 100% is the maximum allowable value for any CMYK color.

B) For press, there may be a couple ways to handle this. i.e. You run a second pass.. print the first pass as 0/0/50/0 then overprint a second pass of 0/67/70/28. However, this is going to considerably darken all colors not just magenta areas. The magenta areas would end up being your brown/red but that extra yellow and black overprint is going to darken all other areas.

So really.... what color you are trying to achieve is kind of mystery....

enter image description here

As you can see that 50% yellow is going to alter everything even if you remove magenta and overprint your color.

If you really want to merely replace Magenta with your brown/red.. you could run a 5 color job (CMYK+1) leaving the Magenta plate empty. Areas where Magenta was not empty are going to create a deeper red....

enter image description here

(Pantone 471 is merely the color I felt was closest to 0/67/70/28, you might pick a different spot. I didn't spend a great deal of time looking and there is no immediately matching spot color I saw.)

Ultimately, it may be possible. However, much more detail as to why you need this, what your process is, and your end goal would assist in a better answer.

  • Thanks Scott for your response. It is a specific printing requirement (for traffic signs) where instead of magenta ink the company used red ink (BS381C No. 537 which is cmyk 0,67,70,28) - but they can't tell us the actual resulting cmyk colour. What I am trying to know is what John Burgess said above i.e. what this colour is: (0(C), 40(0,67,70,28), 50(Y), 0(K)) – Simon H Jan 11 '18 at 8:54
  • It may just be the 0/67/70/28 then a second pass of 50% Y. Or it may mean all art is 50% or 67M70Y28K.. So it's just that some specific areas are pure 50Y while other areas are the 0/67/70/28 breakout. – Scott Jan 11 '18 at 13:51

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