Why is PDF darker than ID file?

I am designing a series of typographic posters in ID CS4. I convert each to PDFs and they look fine.
With one exception. It depends on subtle tonal changes and every PDF version I've tried makes the tones darker. I am attaching two screen captures. The lighter is from the ID original. The darker from the PDF. The changes are somewhat subtle but important. The drop shadows seem to get darker a bit more than the words. How can I get more tonal/color accuracy? Which PDF setting is best? Or must I play (how?) with color settings altogether to get ID and PDFs more in sync colorwise?

> Do you have overprint preview turned on in both ID and Acrobat?
Yes and no but problem solved and this may be related.
Experimentally I turned on Overprint Preview in ID. And there I saw the colors darken as they had in the PDF, even though neither app had Overprint Preview turned on. Somehow the document LOOKED as if Overprint Preview were turned on.
I got many good suggestions here, tried many plus other combinations. No matter what, the PDF was darker, the subtleties were far less subtle, especially in the soft drop shadow and the lightest tones.
I've created about a dozen typographic mini-posters for self promotion. All went from ID CS4 to PDF and all looked perfect in the PDF, except for this !#@%&*%$# one with the subtle tones and yet-more-subtle drop shadows. Why only one? Dunno.
Not saying the problem won;t crop up again in some mysterious way. But it appears I've solved it, sideways. This way:
In ID, I saved it as a JPEG. Looks perfect!!! Came to 58 kb, smaller than a PDF. Here are three screen shots, cropped in to a simiar section: (1) The original in ID CS4. (2) Any of my many PDF tries. (3) The JPEG I am living with. (Let's hope the JPEG generate no later problems.) I do wonder why, now, it opens always with a "Profile or Policy mismatch" window. —???

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Henric Caldas
30 rue de Belleville
75020 Paris
Home : +33.1.46.36.04.55
Mobile : +33.6.59.08.02.27
[email protected]
Le 28 janv. 2014 à 22:48, "H.Spector" <[email protected]> a écrit :
Re: How to include more than 12 files in a new PDF document?
created by H.Spector in Adobe PDF Pack (formerly CreatePDF) - View the full discussion
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Lightroom vs Photoshop Histogram - Very similar
Left: File opened from Lightroom as the Original      Right: Original Photoshop File
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