Export settings for DPI-Lightroom

People often use DPI when they should be using PPI.

PPI stands for Pixels Per Inch, and is used for printing. Pixel dimensions / PPI = Printed dimensions in inches. In other words – the PPI value describes how many image pixels are used to print one inch of paper.

DPI stands for Dots Per Inch, and is the number of ink dots a printer uses to print one inch of paper. It's a property of the printer, not the image.

For screen viewing, PPI is irrelevant, it's only used for printing.

So set Long Edge to 1440 pixels, and enter 72 in the Resolution field. Unless the image is going to be printed, it doesn't matter what number you enter.