"artifacts" appear when converting PDF to CMYK

When using the Preflight "fixup" to convert a PDF to CMYK only (SWOP), I sometimes end up with jpeg-ish-looking artifacts being added around the edges of logos and in photos. I've been troubleshooting this for a while, changing settings and such, and I think I've determined that it happens with PDFs that have been generated using a lossy compression method. I have figured out a couple of workarounds, but since I process a lot of PDFs (sent to me by others) I'd really like to figure out a way to get the fixup to work when I "Analyze and fix"! Anyone have any ideas??
-Jodie

Right, Jodie . . . I may have a work around for you. Instead of running the preflight bit, use TOOLS, Action Wizard. I have attached an action which you must import using Edit Actions under the Action Wizard menu. Once you have imported the action called DAVID, you can choose to run it on a single pdf, or choose a folder of pdf's. You can edit the action and choose to save the converted pdf/s to another location or overwrite. All your users can import this action so you know that everyone is using the same format. This action checks and converts the pdf to CMYK and as a PDF/X-1A, which is a better format and embeds all fonts and extra bits and is better for a repro/print arena. I have tested it on the file you gave and no artefacts!!! If you want to know more on Action Wizard, go to this link.
http://help.adobe.com/en_US/acrobat/using/WSdd9016941e183011-149709e812b380ff7dd-8000.html

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"artifacts" appear when converting PDF to CMYK

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