Now I'm upset cause the renderosity software has eaten up again a fine answer post of me. It's the second time and I have no interest in redoing that every time twice.

And also this complete thread is much more than a academic excourse for a truely simple and trivial thing and much more than I have ever thought about DPI and that stuff my whole life long.

And no fear about my programs. They are all fine may be a bit old the one or other but fully fit on work. But I have none changed in DPI setting. No need for that and so they all start with 72 DPI by default. As also the Canon EOS 2000D there no setting is given to change the standard 72 DPI. I just had a look into the official handbook. And why should I fiddle with DPI. As far as the original pixel size keeps untouched you can work and manipulate as much as you want in e.g. Photoshop. First at the end you need to decide what and where to output and then DPI together with paper size is important.

So for me this is working absolutely perfect and I have no need for printing lots of different pictures automatical. B.t.w. most image formats are not storing DPI as original part of their specification but in between in the so called metadata (e.g. EXIF) and from there they can be read again as far as a program is capable using such metadata. For example even Photoshop CS2015 is killing those metadata from a file if you use "save as ... " and no DPI is anymore. (have a look to the Photoshop forums at Adobe)