Why the White Lines around imported Photoshop Images

Working in CS6, importing native Photoshop images into an Illustrator gradient.  Certain imported Photoshop images, with transparent background, produce white lines bordering the images.   The white lines stand out against the AI gradient.  The whites lines are not visable on screen.  They came out in the commercially printed product.  The overall AI document, with PS images placed and linked, was save to a PDF.  It was then printed from the PDF. The PDF, as viewed on screen, does not show the white lines either.  Why and how do the white border lines (the box surrounding the image) appear?

First I would recommend making sure there are indeed »no pixels« there in Photoshop – applying the Layer Style Stroke can help locate stray, semitransparent pixels.
Other than that I am afraid your print service provider may not have provided optimal output.
What print process was employed anyway?
It looks like flattening effects, but those should simply not be visible in print.
They happen when exporting X1 or X3 pdfs, which disallow transparency, so in creating the pdf the psd files that have transparency are flattened with whatever background and often broken up into smaller parts.
That way a whole mess of fragmentary images can be created, as one can see when one opens such a pdf in Illustrator.
One can avoid that by creating X4 pdfs, which do allow transparency, but if those can be processed by the printer is another question.
But this issue might be more suitable to the Illustrator or pdf Fora.

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