Using my 2015 MacBook pro, running the latest High Sierra OS, I’ve taken a screen shot of a Pages document, image and text, for the cover of an audiobook. Using shift/command/4 produces a 1054 x 1054 image. My research says I need a 2400 x 2400 pixel size with no less than 72 dpi in jpg, tiff, or png.
So, how do I take a higher resolution screen shot? Thanks for any response!