I'm on the plane (again!!), playing with plug-ins in Photoshop, while wearing my noise-cancelling headphones. Ahhhh, the peace and quite.
As you may know, noise-cancelling headphones don't totally cancel all noise. They reduce noise, to different degrees, depending on the noise level and your definition of noise. A baby crying, for example, is not considered noise. :-)
While thinking of noise, I opened a picture that I took with an early iPhone in San Miguel de Allende, Mexico. That image, with a fair amount of noise, is below.
To cancel the noise (actually greatly reduce the noise), I used Topaz DeNoise. I first used the sliders on the left to select the amount/type of noise to reduce. Then I used the slider on the right to fine-tune the noise reduction, in particular, in the shadow and highlight areas . . . somewhat independently.
By the way: all images have noise, even images shot at ISO 100 on a sunny day.
The result of using Topaz DeNoise is the image that opens this post. As you can see, the noise is greatly reduced.
Explore the light,