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My Illustrator working profile is set to sRGB/Coated FOGRA39 and to preserve embedded profiles. Conversion Adobe ACE / Perceptual.

I did a test. I made a print ready PDF in two different ways: 

In the first I linked an sRGB psd-file to the layout and to the second I linked a PSD already converted to fogra cmyk in Photoshop. There I used the Perceptual conversion as well. 

I exported the PDF similarly in both cases: Convert to destination (Preserve numbers), to working cmyk (this case the same FOGRA39). I tested the CMYK psd also without conversion in the export part, and the result appeared the same.

When I look at these files in Acrobat through the Fogra39 profile, they appear different. The one that had RGB pictures converted in the export is a bit brighter, and the one with ready CMYK pictures a bit more dull/gray. I have understood that the conversion process on both programs (PS or AI) should be the same, but still I get different results. 

Is someone able to spot where the difference could come from?

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  • Hard to tell without having access to the files and seeing each step. What about Black Point Compensation? Same settings there? And do you preview in Acrobat with the exact same settings in Output Preview, using the correct profile?
    – Wolff
    Commented Mar 29, 2022 at 17:35
  • Yes I was viewing through coated fogra39 in both cases in acrobat. The black point compensation setting I assume had it chosen in both, but not totally sure. Need to recheck this later.
    – Pocket
    Commented Mar 29, 2022 at 17:41
  • I'll see later if I can reproduce the issue.
    – Wolff
    Commented Mar 29, 2022 at 18:37
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    I tested the 4 rendering intents in both Illustrator and InDesign. It seems that Illustrator only gives the expected result with Relative Colorimetric! For Perceptual, Saturation and Absolute Colorimetric the image converted by Illustrator looks different (worse) than the image converted by Photoshop. In InDesign all 4 rendering intents seem to work as expected with no (visible) difference. It's terrible really! Just another reason for me to not use Illustrator as anything else than a vector drawing application. (It's a bit confusing to test - somebody else please check this too.)
    – Wolff
    Commented Mar 29, 2022 at 21:00
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    OK, so we get the same results. But I can't answer your question as to why this is happening. Sure seems like a bug. Funny thing about graphic design software. First you spend years trying to learn how to do stuff correctly. Then you start to find all the small inaccuracies and bugs which you also have to learn how to navigate through. I can manage, but when I explain stuff to beginners the explanation gets longer and longer. 😅
    – Wolff
    Commented Mar 30, 2022 at 11:07

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