Image Mask Error Message when Reducing Size of PDF

With my Mac, I embed jpg images in Microsoft Word documents, save them as pdf's, and reduce them. Size reduction often fails, with the error message "The PDF document contained image masks that were not downsampled".  Jpegs don't have masks, so I have no idea how to fix this problem, and an extensive google search was of no assistance.

Use PNG images instead use an application such as Graphics Converter, Fireworks to convert to .png from .jpg.
Will have much better images that do not degrade each time they are opened and most often they end up being same size than jpeg's
Jpeg unless you save as a special type is a Lossy format and each time is open (and decompressed) then closed (and then compressed) losses detail
Just open and magnify a jpeg after its been open 5-20 times you notice an out of focus halo looking similar looking to water spilled on paper wil pen ink on it. And it get progressively worse. PNG on the other hand is not lossy and if the original is saved as png never degrade even when reduced in size or or expand within reason in size.  I've being dealing with photos screenshots, images and other for years. Despite what other may say on this list may say if you want an image with little trouble for years of service save as png.

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