Low-res cover image -- but it's not

I just uploaded a cover file.  Lulu's processor replied that cover images should be 300 dpi.  In my InDesign file, the original images are both 600 dpi and I have it set to downsample the images to 300 dpi, so I don't understand what's going on.

Is there a tool that can inspect a PDF and determine the resolution of the photos?  I have two photos (front and back covers) so I need to tell the resolution of each since they might be different.  The two PDF viewers I have (Sumatra PDF and Acrobat Reader) don't do this.
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