When importing a PDF with images, Photoshop CS6 adds faint outlines to the PDF image segments in the file. Prior versions of Photoshop render the PDF correctly. See the attached image for an example.
Chris, thank you for the explanation, I must have overlooked it. From my experience in version prior to CS6 it worked always fine. But anyway.
The problem became now with CC2015 even worser as the old work-around to rastersize the PDF in 2400dpi and than downsampling it to 300dpi does not work anymore. The anti-aliasing has been changed once again.
Thanks to mediengestalter.info I found the solution: One has to generate PDF/X4, and those PDFs containing transparencies can be rendered to an image by photoshop without problems.
If you only have the PDF X3-file, one has to export it to TIFF/JPEG directly from Acrobat.
What I still do not understand is, when these fine white lines are inside the PDF/x3, why do I see it e.g. in Photoshop CS6 and later, but not when producing offset-prints from such a PDF file?
When I export a JPEG from Acrobat there are no white lines as well. Does that mean Acrobat and Photoshop are using different antialiasing engines?
Wouldnt it be clever to add a function to Photoshop to let the user decide which kind of antialiasing he wants to being used when rendering a PDF/x3 or earlier to an image?
And last but not least, why can I export a TIF file directly from Indesign CC2015? Or does that feature has been moved to somewhere else?
In german language edition it is not called Antialiasing but "Glätten". I turned it off and the fine white lines disappeared! So, problem definitely solved. Thank you Chris for your patience!
OK PEEPS. Here is the easiest workaround!
From Acrobat Pro.
Open your acrobat document.
CLICK - Export PDF
CLICk - More Formats
CHOOSE - Encapsulated Postscript
CLICK the settings button next to the word ENCAPSULATED POSTSCRIPT
CHoose General - PAGE RANGE - choose all - click Ok
CLICK EXPORT
CLICK DESKTOP
CLICK SAVE
This is counter intuitive... Try layering the imported image over itself 6 times (this value could be resolution dependent) at 100% opacity normal blend mode (or apply image 100% opacity normal blend mode 6 times), easy enough to do in an action/batch. I can’t explain why this fixes the issue as it should not fix the image, however it did in my tests (after 6 applications a difference blend test revealed no differences).
Hello, the problem is getting worse. These fine white lines do not only appear when using transparency or shadows or something like that. Just place several areas with the same color in InDesign next to another. No transparency used, just plain areas filled with any color. Now export the document as PDF-X4 and import in Photoshop as smart object. Now you will see the lines between these areas. This is an absolutely no-go...
This still appears to be ongoing (CC 2018). We frequently get issues opening PDF's with random artefacts and hairlines appearing. In CS4 they are absolutely fine.
This is frustrating as we have upgraded our studio to CC but have to keep a copy of CS4 as the 'latest and greatest' version of Photoshop isn't as good.
There must be an option to rasterize X3-PDFs in the old way in current Photoshop Versions! You
can't keep CS5.5 on your computer just in case you get anything else
than X4.. Can you even buy that software? It's ridiculous! The problem is around for 7 years now, we have Photoshop CC 2019 and still no fix
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