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Paul BurrowsFlag for New Zealand

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How can I change a photos dpi

I have taken a lot of photos on a FinePix S9600 9 megapixel camera and want to create a collage of 220 of them.  The photos have attributes 3488x2616x26b jpegs.

When I copy photos into publisher to create the collage the image is sized as if it will be printed at 72dpi (I think) with these measurement dimensions.

I presume I will really want the photos in at about 1200 dpi for when I print them so they dont look grainy.

How do I change the attributes so the photo is at 1200 dpi instead of 72 so when I drag the photos onto my sheet it is the correct size?
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Is there any was of automating so I can set parameters for all photos?

Just to save me doing this 218 times
Thanks