How to change resolution of an image ?

What is the command/keyword for changing resolution(ppi) of image in matlab? How we can use that command? Please kindly give an example

[David Hill]

You might look at the documentation in matlab for: Singl Image Super-Resolution Using Deep Learning. It provides examples.

[Image Analyst]

You mean like if you printed it to paper or a PDF?

[ABTJ]

please check the updated question, I have edited, it was pixels per inch , my intention wasn't dpi