Does anybody know - what's the recommended resolution for screenshot-type images, for Pillar-generated PDFs?��

I don't know much about creating printed materials (that will also be displayed on the web).��

Specifically:

1. Is it ok to just put in arbitrary resolution and count on LaTeX or whatever to size them to the printed page correctly?��

2. Does it matter (is it advantageous) whether one puts the width= attribute on the figure declarations?

General advice?