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roberte13933108
Known Participant
March 18, 2020
Pregunta

Exporting RGB, CMYK and Grayscale to print pdf

  • March 18, 2020
  • 1 respuesta
  • 14497 visualizaciones

I have been asked to start a new thread, so here it is again. I am using ID CC2020 15.0.2, and Windows 10. I am trying to export from ID to a pdf for commercial print on Indigo presses. - RGB color (Adobe RGB profiles embedded), plain K b/w (images scanned from b/w negatives GRAYSCALE with gray gamma 2.2 embedded) and CMYK process colours. None of the ID output settings produce the same result as converting the RGB into CMYK in PS and substituting the new colour files before exporting the whole work with no conversion. This method kept the printed K at the correct density. 

When exporting using the RGB photo files, CMYK process colors, and the GRAYSCALE files, the grayscale is washed out if the export output is 'convert to destination'  It mattered not which PDF-X was selected, or none,  or what destination profile (ISO coated V2 300% ECI) was set, or preserve numbers,  or ignore profiles, or not. The color - both RGB images and CMYK process colour - were converted just fine, but not the b/w K files which were rendered as a shade of grey.  I tried sending a test pdf unconverted which went through the rip converting both RGB and CMYK colour correctly, but the b/w  was washed out K again. Does anyone have a fix for this?

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1 respuesta

rob day
Community Expert
rob dayCommunity Expert
Community Expert
March 18, 2020

As I mentioned in the other thread InDesign does not have a grayscale color space—a grayscale object’s values get put on the Black plate unchanged, and the Overprint Preview is color managed by the assigned CMYK profile.

 

I think your problem is the Gamma 2.2 profile you are using for the grayscale in Photoshop confilcts with the ISO Coated V2 300% press profile you have assigned in InDesign, and are using as the PDF/X-4’s Output Intent.

 

The solution is to assign or convert the Photoshop grayscale to the Black Ink version of the ISO Coated V2 300% CMYK profile. To do that open Color Settings in Photoshop, from the Gray Working Space dropdown choose the ISO Coated V2 CMYK profile. That will set the Gray Working Space to the Black Ink version of ISO Coated. You can then use Photoshop’s Convert to Profile... to convert your Gamma 2.2 grayscales to the Black Ink ISO Coated profile:

 

Here in Photoshop you can see the difference in preview between Gamma 2.2 (top) and Black Ink ISO Coated

 

 

If I convert the Gamma 2.2 version to Black Ink ISO Coated and place in InDesign with Overprint turned on I get a matching preview. Note that you have to turn on Overprint preview in order to get a Print soft proof.

 

The exported PDF/X-4 with Output Preview on, matches the ID Overprint Preview

 

    R
    roberte13933108Autor
    Known Participant
    March 18, 2020

    there is no iso coated v2 300% profile listed under the working space gray drop down in my PS color settings. It is listed under CMYK working space drop down only.

    R
    roberte13933108Autor
    Known Participant
    March 27, 2020

    Convert to profile black iso v2...the cmyk iso profile is from another printer. This new printer did not specify an output intent profile.


    The hard copy pulls arrived from the printer and yes they are using a low black density on the press. But this also seems to render the CMYK images also lower color density and raise the overall dmax of the Grayscale images which match the solid black (CMY)K backgrounds where they are used in the design. I put it down to the matching ISO v2 300% profiles installed with your help - thank you Rob and Adobe Support Community. I am not 100% happy as the (CMY)K black is a very dark grey, and the grayscale density does not match that of the Colour, but the resultant print looks better.

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