Noise reduction workflow in Lightroom and Photoshop Camera Raw
The controls in Lightroom and Photoshop Camera Raw are pretty much the same, so below is a quick overview of what each slider does and how to use them. In Lightroom, you will find the Noise reduction tools in the Develop module and in Camera Raw, you will find it as the third tab on the hand side of the screen, it is the Detail tab.
The sliders do the following:
The noise reduction sliders in Photoshop Camera Raw, are identical in Lightroom
Reduces luminance noise which is noise coming from over or underexposed pixels, this can be quite prevalent in long exposures.
Controls the luminance noise threshold. This is good for noisy photos. Higher values preserve more detail but can produce noisier results. Lower values produce cleaner results but also remove some detail.
Controls the luminance contrast; useful for noisy photos. Higher values preserve contrast but can produce noisy blotches or mottling. Lower values produce smoother results but can also have less contrast.
Reduces color noise. This is often noticed in the underexposed shadow areas of an image.
Controls the color noise threshold. Higher values protect thin, detailed color edges but can result in color speckling. Lower values remove color speckles but can result in color bleeding.
This slider controls the smoothness of the colors in the image. This is useful if you still have some unusual color noise in your image after you have made all your adjustments above. Use this to finish off the noise reduction workflow.