This is a very simple photo effect:
 
Duplicate your photo 3 times, so that you have 3 photo layers.

the bottom layer blending mode should be " normal "
the middle layer blending mode should be " screen "
and the top layer blending mode should be " soft light "

now play with the opacity sliders. the screen layer will probably need to be pretty low, unless it was a really dark photo. but play with the opacity of the top 2 layers, it will be different for each what looks " right "

you can even flatten it, then repeat the process again to get an even more vibrant effect.

I do this on almost every photo.