Image resolution measures the number of pixels in an image as it is displayed or printed. Pixels Per Inch (PPIPPI stands for Pixels Per Inch. It measures the number of pixels in a linear inch. More) refers to the linear number of pixels when printed.
Print resolution measures the number of ink dots in a printed image. Print resolution is described as Dots Per Inch (DPIDPI stands for Dots Per Inch. DPI measures the number of ink dots in a printed inch. More).