How is the resolution variable or when would we change the resolution of an image and why?

How is the resolution variable or when would we change the resolution of an image
and why?

It all depends on the output:
* for viewing on screen 90 -120 ppi
* for printing on a laser printer 180 -300 ppi
* for printing on a desktop printer 240 - 300 ppi
Some people claim 360 ppi is optimum but I don't see any difference compaired to 300 ppi at least not with the naked eye...

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How is the resolution variable or when would we change the resolution of an image and why?

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