Cleaning Images Using Frequency Separation
If you're a Photoshop user and not familiar with Jimmy McIntyre, I highly recommend the tools and courses available on his website, and his superb YouTube channel.
Here, Jimmy explains in a short informative video how to use the technique of frequency separation to smooth out banding and posterizing, clean dust spots and lens flare, and to target sharpening on the details in your image while leaving the rest untouched.
Simple but very powerful technique!
Clean Up Your Landscapes With Frequency Separation
If you found this useful, please feel free to leave comments or questions below, or add other techniques that you use for image cleaning.