Strange lines appear around transparent PNG's when document PDF'ed

Hi
I have inserted some transparent PNG images into my Pages document, and they look fine on my screen, and they also look fine when I export to PDF and view in Preview.
However, if I view the PDF in Acrobat (or send it to a Non-Mac user and they view it in Acrobat), there are thin lines around many of the PNG images, which make them look ugly and sloppy, and very un-Mac-Like! Any ideas why these lines are appearing and how to prevent them?

Hi logree
Welcome to the forum.
My guess is that it is showing just the edge of the masked background used to hide the alpha channel background of the .png.
This happens I think, because the postscript mask may be centred on the outside rows of pixels in Acrobat, with half the pixels still being revealed.
You can try masking in Pages' instead:
+Menu > Format > Instant Alpha+
or try a Photoshop file with transparent background, to see if that eliminates the problem.
Peter

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To show what I'm talking about, I've posted a picture of screen captures with explanations at: http://www.viveredesign.com/images/example3.jpg
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