I tried this a while ago, but just found the colours weird and distracting, probably because I don't really have a problem with the normal colours/intensity at

I tried this a while ago, but just found the colours weird and distracting, probably because I don't really have a problem with the normal colours/intensity at any time, but more a gamma issue. I was hoping more for a decent gamma adjustment tool as there don't appear to be any decent free ones out there.