Originally posted by Mark Ransom There's no rule requiring you to print at an even DPI value. If you don't scale the image yourself the printer driver will generally do it for you.
Indeed . . . but for my art prints I have been following some guidelines set out by Jeff Schewe in his book,
The Digital Print. I try to stick to the printer's native printing resolution for my art prints. For other prints I don't worry about it. Schewe wrote,
The Finest Detail option is unique to Epson (although Canon pro printers also have a high-resolution reporting option as well). Normally, the Epson printer’s reported resolution is 360 dots per inch, and the Epson Pro printers actually have 360 nozzles per inch on the printhead. When you select Finest Detail, the driver reports to the print pipeline that the printer is a 720-dots-per-inch device. This is a critical thing to understand. If you were printing a textural fine-detailed image and the native resolution, uninterpolated, is above 360 pixels per inch, you’d want to upsample to 720 and select Finest Detail" [page 186]. He notes later in the book that if a image scaled for printing has a resolution higher than 360 dpi (his example has a print resolution of 424 dpi), he sets the Print Resolution in the Print Job panel in Lightroom to 720 dpi and sets the Output Resolution to 2880 dpi to create the best possible print [page 248].