Downsample to Twice the PPI of the Detail You Want to Preserve

[thebestcpu]

Epson is producing millions of their printheads and sell them as well to other companies; the overall design - piezo elements etc was already quite old - it could be scaled to differents widths and nozzle rows, but just look to the
printhead of the WF2010W - just an entry level little printer from about 2012, Its printhead is still used in most entry level Ecotank printers - this after more than 10 years. And you see that as well with the higher count printheads - their design is pretty old. The is nothing wrong for the user, they last forever, but Epson came out with the new generation of printheads - they call it Precisioncore - which now runs with 600dpi. I remember some comments that the new design delivers a much better yield in production - the main reason for the new design was manufacturability and not so much adding particular features.

I remember as well a test of photo printers - long time ago in a photo magazine - not published anymore, and they tested the effective resolution on the paper - with the siemens star printed - this was a very rare test - I have not seen any other printer test in popular magazines testing resolution. The numbers were as you can expect them - Canon printers in the range of 300 - 320 dpi - and Epson printers in the range of 330 - 350 dpi which makes the 600/720 dpi difference. so yes - that's not really visible in prints - and barely visible in specific test patterns.

Up/downscaling - image data on the way to a printer passes through the same resampling software in the driver regardless if it is up or downsampling - or nothing at all if you feed data with correct dpi from other software - Qimage - PS - Lightroom whatever.

Thanks for the response @Ink stained Fingers
I have recently finished about 24 different Siemens Star Chart tests under various conditions for the Epson p900 and captured the results with my copystand, camera, and macro lens. I will post the results after figuring out the best way to organize and summarize them. It was revealing