Something I've been messing with:
Lum Frequencies
Long story, so I'll keep it short. If you've ever used High Pass to boost contrast, you might want to give this a whirl. It allows you to boost contrast in the Lum channel on different frequencies using some basic scaling tweaks. Because it operates on Lum, it will not over-saturate pixels like the some of the regular High Pass tricks.
Lum Frequencies
Long story, so I'll keep it short. If you've ever used High Pass to boost contrast, you might want to give this a whirl. It allows you to boost contrast in the Lum channel on different frequencies using some basic scaling tweaks. Because it operates on Lum, it will not over-saturate pixels like the some of the regular High Pass tricks.