Notice that as the print size doubles, the megapixels required increases geometrically. You can make nice 8″ x 10″ prints with a 6 or 8 megapixel camera, but to make a true photo quality 16″ x 20″ print, you need between 24 and 30 megapixels.
Print, ensure that your file size is 4800×6000 pixels. For a crisp, clean 8×10? Print, make sure the size of your file is 2400×3000 pixels.
A megapixel is 1 million pixels. It’s an area measurement like square feet. A typical 8 megapixel camera produces images that are 3266 x 2450* pixels. If you multiply 3266 by 2450, you get 8,001,700 or 8 million pixels. To find the largest photo quality image you can print, simply divide each dimension by 300:Photo mega pixel print sizes