Native resolution.

Native resolution is what the nozzle plate gives you: the reciprocal of the effective nozzle spacing across the array, quoted as native dpi or as nozzles per inch per color. Anything above that figure is constructed rather than fired, out of extra passes, an interlaced carriage step, or finer drop placement along the scan axis. Spec sheets rarely say which of the two they are printing, and the word doing the hiding is usually an adjective: Epson lists a maximum print resolution of 5760 x 1440 optimized dpi, a density no nozzle plate on that machine is drilled at. The question that cuts through it is nozzles per inch per color, and the sheet is where it stops being answered: that Epson document quotes the resolution and never states a nozzle count anywhere. Quote a job at the headline and the arithmetic catches you at the press, because the machine only reaches that figure by adding passes, so either the throughput you costed disappears or you ship at the resolution the head really has, against a proof the customer already signed at the other one.