Recent tutorials on Sizing Images in RW esp. Foundation?

I have searched here but not yet found a tutorial on sizing images in Foundation. Looking for best practice guidelines for sizing images used in logo, full browser backgound, Section (BWD) backgound, smaller panel-sized spaces (300 px), etc. One thing I want to do is to resize (??) place what are now wallpaper-sized images (1920x1080, 1920x1200) in different size spaces (browser, section, panel) that will work on desktop, laptop, tablet, phone sizes. Any suggestions? Thanks in advance, Wasting Away in Rapidweaverville Preview Land.