Answer by Tony Corrigan for Is there any practical difference between saving at 300ppi or 72ppi?

As a professional photographer for 30 plus years I can assure you there are considerable differences between DPI values. It might be better to consider DPI as a factor about your final intentions for your photograph. As some choices are not reversible easily it is often sensible to keep two or more versions of your image . A lower 72 DPI version will display perfectly well on any social media and most pc's and TV's. However if you intend to make a print or take your image to your local colour lab then you will need a 300DPI version to use as the master copy to ensure you get the best result. The reason photographers choose raw format generally is to maximise the information in the image against the compression technology that occurs using JPEG format. Also you need to remember that even with the leaps and bounds of the new Ai software's for upscaling the simple rules are that you can easily down size your 300DPI image to 72 DPI without any problems , however if you try to bring your 72 DPI image up to 300 DPI you will loose a considerable amount of detail permanently . Hence you need to keep your 300DPI image as the master version and make all your other versions from it. There are many monitor screens running at 96 DPI these days so most pros save at 100DPI for social media and internet work .