How are the subtle touch ups done on these?

[beefhitler]

These images from GoPro Hero4 seem touched up in a very subtle way. I am just wondering what has been changed in these? I know there's sharpening. My guess would be they played around with the curves but there could be more layers. Or maybe they have just been played around on Lightroom and saved for web? Need your expert views on this please.

I think they have been shot on Protune in the GoPro with a flat color profile.

http://abekislevitz.com/gopro-photo-stream/

[Doug Nelson]

Re: How are the subtle touch ups done on these?

They do appear to have had Vibrance applied.