CMJN, RVB et PDF : j'en deviens fou

Community Beginner ,
Aug 11, 2022 Aug 11, 2022

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Bonjour à tous,

 

J'ai lu tous les tutoriels et les forums et je me décide à poster ne comprenant pas d'où viens l'erreur.

Je souhaite réaliser un joli sticker bleu à imprimer chez un imprimeur (en quadri CMJN).

J'ai bien conscience des différences entre RVB et CMJN c'est pour cela que j'ai travaillé uniquement en CMJN. à partir de là, j'ai 2 problèmes :

 

1 - mon docuement PDF (où j'ai bien précisé cmjn en sortie) a un bleu beaucoup plus sombre

2 - ce n'est pas un problème en soit, mais quand j'essai de vérifer le bleu que j'utilise HEX : 212C42, Illustrator me sort un code CMJN (100,81,45,51), alors que sur tous les convertisseurs en ligne le bon CMJN devrait être : 50,33,0,74

 

Avez-vous des explication et solutions ? Je n'en dors plus.

J'ai un macOS Big SUR v11.3 / Apple M1-2021

Un grand merci pour votre aide.

Manu

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correct answers 1 Correct answer

Community Expert , Aug 11, 2022 Aug 11, 2022

How are your Color Settings setup?

If you are working in a CMYK document, don't use HEX colors, they are another way of specifying RGB values and get converted to CMYK in a CMYK document.

Don't use Apple Preview to check your files, use Acrobat.

The online converters don't use color management and always give the wrong conversion from RGB (HEX) to CMYK.

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Community Expert ,
Aug 11, 2022 Aug 11, 2022

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How are your Color Settings setup?

If you are working in a CMYK document, don't use HEX colors, they are another way of specifying RGB values and get converted to CMYK in a CMYK document.

Don't use Apple Preview to check your files, use Acrobat.

The online converters don't use color management and always give the wrong conversion from RGB (HEX) to CMYK.

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Community Beginner ,
Aug 12, 2022 Aug 12, 2022

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Thank you Ton for your answer.

Allright for the value HEX to CMYK !

I took screen shots of my color setting. My document is in CMYK. And I force the PDF exprot in CMYK to be sure.

Do you see what can be wrong ?

Thank you a lot

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Community Expert ,
Aug 17, 2022 Aug 17, 2022

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How does it look in Acrobat with synchronized color settings? You don't include profiles in the PDF so Preview does not know which CMYK you are using.

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Community Beginner ,
Aug 17, 2022 Aug 17, 2022

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It looks good with acrobat ! Thank you. Do you recommend including profiles in the PDF ?

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Community Expert ,
Aug 17, 2022 Aug 17, 2022

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It depends, when the PDF is placed in another app which uses a different profile, some color conversion might take place, which is not so much a problem with images, but vector elements with 100% black would be converted to a mix of CMYK percentages. When there is no profile the existing values are used.

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