I have a background image I want to use with the theme that I guess is used behind the slider and on some of the pages with header text. At the minute it is HUGE at 1920 x 1200. What would be a good size to reduce that down to that will work with most modern browsers on big screens, i'm guessing a 21" imac is about average screen size these days?
I tried measuring it at around 510px high on screen but it might need to be bigger.
Any advice offered would be most welcome :)
Where else is it used? In the footer?