I've run into this lately, and I thought I'd figured out what's happening, but apparently not. This has happened in both CS4 and now in CS5.

I generated a PDF (Acrobat 5, PDF 1.4) of a book with many grayscale images. In the PDF, the first page (a full page picture with type superimposed on it) is 10%-20% lighter than the PSD file in ID. All of the other grayscale images look right, just this one picture.

I saw a similar problem a week ago when I exported a PDF of another part of this same book. In that case, one photo covered both pages of the title page spread. There was only the photo on the verso, but on the recto, I placed a text frame of the title and authors at the top and a vector graphic with the publisher's name at the bottom. I applied a feathered drop shadow to the vector at the bottom. When I exported the PDF, the image on the verso looked correct, but the part of the image on the recto looked 10%-20% lighter. I repeated it four or five times with the same results, so I attributed the problem to flattening the transparent effects of the drop shadow.

Today, I'm not using any transparent effects, and I've successfully exported PDFs for the other files in this book. Only this one page appears noticeably lightened.

All of the images are either PSD or JPEG, and they are all grayscale, not CMYK, RGB, or LAB colorspace.

Any ideas?

Thanks.


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Michael Brady
michaelb@michaelbradydesign.com

Also, my book, "Thinking Like A Designer," is now available at

https://www.createspace.com/3462255
or
http://snipurl.com/z43se
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