Profil impression Offset pour bichromie

New Here ,
Mar 11, 2021 Mar 11, 2021

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Bonjour 

j'ai un livre à imprimer en offset en bichromie noir + PANTONE Warm Gray 2 C

savez vous quel profil de sortie je dois utiliser dans l'export du fichier (impression) sous Indesign

pour de la quadri j'utilise le Coated Fogra 39 mais y a t il un profil pour la bichromie ?

Merci

 

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Import and export

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Adobe Community Professional ,
Mar 11, 2021 Mar 11, 2021

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If you are using Process Black for the black channel of the duotones (the black ink is named Black in Photoshop) then you have to set the Export>Output> Destination profile to Document CMYK or set Color Conversion to No Color Conversion, otherwise the process black channel will get converted to 4-color CMYK. Either Document CMYK or No Color Conversion will export the duotone values unchanged:

 

Screen Shot 4.png

 

If you are using a Pantone spot black —i.e. PANTONE Black 6C—for the black channel, the CMYK profile has no affect on the soft proof preview or the export numbers. The duotones will export with their Photoshop output values unchanged—the 1: & 2: values you see in the Info panel with the eyedropper set to Actual Color.

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New Here ,
Mar 11, 2021 Mar 11, 2021

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Bonjour Rob 

merci pour votre réponse 

j'ai donc appliqué votre destination en aucune valeur de couleur comme photo ci dessous

01.jpeg

 

Est ce juste ? est ce suffisant ? 

 

Dans le gestionnaire de couleur j'ai toujours les 5 couleurs est ce nomal ? voir photo

02.jpeg

 

MERCI BEAUCOUP 

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Adobe Community Professional ,
Mar 11, 2021 Mar 11, 2021

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Yes, there are always the 4 CMYK inks plus any document spot colors. Your duotone colors are set to Black and PANTONE Warm Gray 2 in Photoshop and the Black ink maps to InDesign’s process black plate—the [Black] swatch. If you give the Black Ink a different name it will show up in InDesign as a new spot color, but you would still have the 4 CMYK inks + the 2 spot colors. 

 

Using process Black for the 2nd duotone color is probably the best choice—with a PANTONE spot black there would be two black plates in the document and it would be easy to confuse them.

 

A Photoshop Duotone with no curves applied and the first ink set to Black (InDesign’s process black)

 

duo1.png

 

InDesign’s Separation Preview shows the same output values:

 

 

duo2.png

 

Export to the default PDF/X-4 preset

duo3.png

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New Here ,
Mar 11, 2021 Mar 11, 2021

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Thank you very much 

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New Here ,
Mar 12, 2021 Mar 12, 2021

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Hello Rob

J'ai une autre question 

quand je produis mon fichier PDF pour l'impression selon les normes prècédentes, et lorque j'ouvre ce PDF je constate que les photos en bichromie sont légèrement différentes que sur photoshop ou Indesign : un peu plus sombre et dense et pour certaines plus de grains (voir photos ci dessous)

Est ce normal ? 

Quel est le fichier référence , Le PDf pour l'impression ou les fichiers sources photoshop ? 

Merci

 

détail grain photoshop 

20.jpeg

 

Détail grain du PDF

21.jpeg

 

Photoshop 

10.jpeg

 

PDF

11.jpeg

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Adobe Community Professional ,
Mar 12, 2021 Mar 12, 2021

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There shouldn’t be a change in image detail. Does it happen if  you export with the default PDF/X-4 preset?

 

Can you Package the InDesign document with the placed duotones and share via Dropbox or your CC account?

 

To share via your CC account copy the InDesign and Photoshop files into a folder inside of your user>Creative Cloud Files folder. That will sync the files to your cloud account, right click the folder and choose View on Website, get the link and post it here 

 

Screen Shot 12.png

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New Here ,
Mar 17, 2021 Mar 17, 2021

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Hello Rob

All the files at 

https://www.dropbox.com/sh/vz0czsrnj9v6qpp/AABRU4a5Vq98P2USgJKd5eUFa?dl=0

thank you for your help 

Nicolas

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New Here ,
Mar 17, 2021 Mar 17, 2021

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Adobe Community Professional ,
Mar 12, 2021 Mar 12, 2021

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Also, what application are you using to view the PDF? Make sure you use Acrobat Reader—or AcrobatPro DC if you want to check the output values.

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New Here ,
Mar 17, 2021 Mar 17, 2021

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Yes I use Acrobat Reader

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Adobe Community Professional ,
Mar 17, 2021 Mar 17, 2021

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Hi Nicolas, the Photoshop duotones are noisey, which is more obvious if I zoom in—here’s 300%:

 

Screen Shot 8.png

 

The noise is getting exaggerated a bit on the export to PDF because of the default PDF/X Compression settings. The image in the page layout has been scaled down to 43%, so the effective output resolution is 560ppi. The default Compression setting downsamples any resolution over 450ppi to 300ppi, so the downsample plus the JPEG compression is exaggerating the noise. I’m not sure you will actually see that in the print, but you can see it at high magnifications.

 

Here’s a comparison of the default compression you used (top) vs. downsampling and compression turned off (bottom):

 

Screen Shot 7.png

 

Also, I don’t think it will affect output, but .PSD is probably a better format than .EPS for any image file. 

 

PSD gives you more resolution and color info in the InDesign Link Info panel:

Screen Shot 9.pngScreen Shot 10.png

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New Here ,
Mar 17, 2021 Mar 17, 2021

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Hello

j'ai donc mis la photo au format final impression et enregistrée en .PSD voila le PDF produit avec en haut la premier photo en .eps et en bas la nouvelle redimensionnée en .PSD

 

02.jpg

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