Pixels per inch: a measure of resolution. Either (a) the resolution of a image when it is printed at a specific physical size; or (b) the physical resolution of a display device. DPI (dots per inch), which refers to the output resolution of a print device, is often used in error in place of PPI.
I downloaded a paper back book cover template from Create Space and loaded it up into Inkscape (and used GIMP to crop the background images to fit the template). What steps should I take, and what ...