How do I set resolution

I'm having a book printed.  I tried to upload a .pdf of InDesign using photos I edited in iPhoto 09.  The printer's "preflight" system said the resolution on the photos was too low--that they'd be fuzzy.  They recommend a minimum of 150 dpi.  How in the world do I set that resolution?  Am I going to have to re-edit them all in photoshop to do it? 

You do not "set" dpi - you calculate it - Dots Per Inch - take the photo digital dimensions in pixels and divide by the inches you will be printing to get DPI
The minimum digital size for a 150 DPI print is the final print dimensions times 150 - a 4x6 print must be at least 600x900 pixels - an 8x10 at least 1200x1500 pixels - and so on
See The Myth of DPI for additional information.
LN

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