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Excellent explanation both of you! :}

Some (hi-end) users reported that for some ink jet printers, it is good to work on derivates from the resolution.

Say your printer can make 2880 dpi (max theorical resolution of the smallests dots of ink) it is good to make your files at 288 ppi (pixels per inch) or 360 ppi instead of the "rule of thumb" of 300 ppi (in most cases, there would be an "uneven" interpolation) IIRC, they were talking about the professional range of Epson printers (the 2200, the 7600 and 9600...) Now, it's up to you to test what works best for you!