Export to PDF causes fringing around transparent PNGs only in Acrobat

If I export to PDF from Keynote '09 using the "Best" setting, I'm getting black fringing around solid elements in a transparent PNG that was placed in the original keynote doc. This fringing does not occur when the PDF is viewed in Preview. Any suggestions on how to remove the fringing?
Example is here: http://i.imgur.com/3QXGf.jpg
Thanks in advance for the help.

Perhaps my explanation of why this is a problem wasn't clear. The type of PDF links that Pages creates are, quite reasonably, set to highlight when clicked (there are a variety of options in PDF for the visual action of a clicked link; highlight is best for user feedback. In an ideal world, when the user clicks a link in a PDF, you want the a highlight box to appear over the text of the link - exactly over it, not too large, not too small.
Because Pages creates two links for each internal hyperlink, but the user will click only one of them in the PDF (whether in Preview or Acrobat), the highlight is almost guaranteed to be wrong for every click. If the user clicks the top link, only the top two-thirds of the text will highlight, and if the user clicks the bottom link, there will be a weird highlight either on the bottom third of the text or underneath it. It's inconsistent, but in most cases, it's wrong.
Obviously, this is only cosmetic, but it's the kind of mistake that hurts usability and detracts from the user experience, and as far as I can tell, there's absolutely no reason for it, making it a bug.
cheers... -Adam

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I take little encouragement on how to use Apple discussions from someone who has made 3 posts, one of which is extremely difficult to understand the other places blames on the responder for not reading it correctly and the bad software.
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Export to PDF causes fringing around transparent PNGs only in Acrobat

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