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PDF/X and Color management in InDesign

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    • #33677
      Anonymous
      Inactive

      When it comes to Color management and PDF making from InDesign, it always made me a bit confused. Hopefully someone here can maybe enlighten me. So about the whole Color management, color profile, pdf profile thing, I find many ‘articles’, but some are older than the other (which might be outdated), and some even contradict to each other. I dont necessary need a answer saying, this is the right way to do! But more of explaining everything as it is, and why and when choosing this and that method. Is there a site, more in the sense of a Wiki than a blog, which can give a definite explanation of this matter?

      I wanna try explain different scenarios and how I see it, and please correct me if I am wrong.

      I understand that using PDF/X profiles is the way to go. Is it my correct impression that the different pdf preset (pdf/x-1a, pdf/x-3 and pdf/x4) are not so-called revisions of each other, but each of them are intended for different purposes and workflow? If this is the case, which different purposes? If not, can I avoid using PDF/X-1a and just stick to the latest preset?

      Also, few years back I read that retaining RGB colors as long as you can, in a publishing workflow is ALWAYS the best way to go, as it keeps more color data. Is this always true? Is there some scenarios where actually converting to CMYK is better?

      My biggest concern and frustration, is that I never found a copy/print center which take me serious when it comes to color management. I always try to do it the correct and best way. But, if I hand-in a pdf made in InDesign using preset Press Quality, I still dont know what the print center does with the file? How do I deal with this? If I use a PDF/X preset in this case, is it a bulletproof option to get the right color from my InDesign file?

    • #33679
      Gert Verrept
      Member

      Lars,

      Depending on the version on pdf/x more or less “options” are allowed. A pdf/x-4 allows “transparency”, all the other versions do not. This means that if you make for example a drop shadow, only the pdf/x-4 will render it correctly without flattening. Pdf/x-1 has no such thing. All kinds of transparency will be flattened, causing some problems when printing a complex design.
      This site: https://www.vigc.org/ will help you find the right settings and even more, it has a fantastic tool called https://www.vigc.org/vigc-output-essentials/ which is in fact a “plugin” for Indesign or photoshop. It will help you to get a good pdf out and to set up a good indesign file. Their life preflight profiles are good too.
      This site: Ghent PDF Workgroup (www.gwg.org) will give you all the possible settings for a good pdf. Depending on what you want to print, settings can or have to be changed.
      The RGB – CMYK question then. Every one has his own idea about it. When you print, it’ll always be CMYK. If the image has a profile with it, use it. If an image comes without a profile, I’ll be a wild guess how it will look printed.
      Using a preset is not bulletproof, but the chances are that it comes out ok. If you printer has a good and recent “rip”, using a pdf/x-4 is no problem (check the vigc site fora summary of all rips supporting pdf/x-4).

    • #33680
      Anonymous
      Inactive

      Hi thanx for your feedback. I’ll have a look at the websites.

      Yesterday, I made a test from InDesign CS5. I tried to make a simple 50% transparent colorbox over a photo. I wanted to test how a PDF/X-1a does the pdf, since it doesn’t support transparency. However, the pdf looked just as it does in InDesign, incl. the semi-transeparent box.

      So when people say PDF/X-1a doesnt support transeparency, does it mean it just ‘look’ right on screen and will come out wrong on print? Or have InDesign done something in the process of actually making the pdf right, even when using PDF/X-1a, so it comes out on print correct? Sorry, I just try to get my head around this and understand what InDesign actually does when exporting to PDF using different preset.

    • #33681
      Gert Verrept
      Member

      As you pointed out, the pdf/x-1 “looks” right, and it is right, but if you would try to select objects in the pdf, you’ll notice that if you move a “transparency” figure, it is composed of lots of little objects. If you do them same with a pdf/x-4 the “transparency object” will still be one object.
      Also, the settings are different. Look in the “advanced” tab of the pdf-presets and you’ll find an option “transparency flattener”, which is grayed out in pdf/x-4 and not in the pdf/x-1.
      For the best flattener presets for CMYK check: https://www.digital-engineer.net/archive/entry/indesigns-hidden-transparancy-flatteners/
      and look for “gwg2400”.
      So, it’s not the pdf which can cause trouble, but the way it’s made. Old rips don’t support pdf/x-4, so a pdf/x-1 is needed, and flattening will be needed. If it’s a complex design, it can mean trouble, but not always.
      Hope this helps a bit more.

    • #34241
      mimi reed
      Member

      1. assign the correct color profile in InDesign

      2. follow the ease steps at https://i-adobe.com/2013/07/07/one-possible-way-to-make-a-pdf-x-using-adobe-indesign-2/

      make sure you export as PDF/X 4 if you you’re using transparencies in the Indd Document

      hope it helps, REEDesign
      i-adobe.com

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