The answer is “a lot of it” – much of the post-production involved tinting and color-correcting.
But the much-ballyhooed “no CGI”? Yeahhh, not quite. The stunts and crashes were indeed primarily practical, and are truly impressive – but digital insertion of weapons and characters did happen, as did some green-screening.
Where? Let Brave New World’s visual effects reel break it down for you.
Brave New World | Mad Max Fury Road | vfx from Brave New World on Vimeo.