cameraclicker; actually the blur was already there as I panned on them from the bus window. I just thought the colour would make it mean something.
the function was a ‘region out of focus’, using a feathered radial greyscale around the two young people. I use a couple of freebies; one called Photoscape, and Photofiltre. There’s no way I can afford Photoshop! Gimp is a steep learning curve that I may eventually decide to climb, but for now I really just want to take photos for the sake of it.