[pchelpers] Changing DPI of an image

I examined several images that I have on my computer hard disk. They are
72 dpi which I understand is fine for email and WWW sites.  I noticed some-
where that if you want to have prints made, that the images should be in 300
dpi. I have a setting for this on my HP scanner and I have varied image 
software
that came with the computer including Paint Shop Pro.
Is there a way that I can change existing images on my hard disk to 300DPI?
Should I examine the book on my less expensive digital camera to see if it 
will
take a picture and store it at 300DPI?

Some direction for me would be appreciated. 




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