This is something I've never understood. DPI only makes sense if you need to accurately represent some physical dimensions in an image. Most of the time, you do

This is something I've never understood. DPI only makes sense if you need to accurately represent some physical dimensions in an image. Most of the time, you do not. You would just map it onto screen pixels somehow, most probably dictated by the UI layout around it. Color profiles however, yes, those are indeed important.