Mongo has a project where he has to shoot inand get files in 300dpi. Looking at random at some of his old images there seems to be no sense to it - some are 240 dpi and some 300dpi. Mongo cannot remember how to get one or the other deliberately. Has to be minimum 27cm X 24cm and 300dpi resolution . Using a D800 :-
1. what should the camera be set to ?
2. if Mongo has some large existing files but at 240dpi, what is the best way (Mongo has tried a few ways already) in Photoshop to make them 300dpi which least affects the IQ ?
Any and all advice very gratefully received. There may even be the remnants of a thoroughly chewed aardvark carcass in it for you.......hmmm....