what does changing the image size do?

[drmac]

If I have an image size of 3888X2592 pixels and change it to 1024X683 pixels, what will it do to the final product that is printed?

[Jon]

It'll be of lower resolution. You're combining slightly more than 14 pixels into one (area, not linear), so you'd get about 1/4 the linear resolution. Recommendations are to allow at least 250 pixels/inch for prints; so you'd effectively be limiting yourself to about a 4x2.5" print before it started breaking up.