The Detail tab of the Camera Raw dialog box
has controls to reduce image noise, the extraneous visible artifacts
that degrade image quality. Image noise is made up of luminance
(grayscale) noise, which makes an image look grainy, and chroma (color)
noise, which is usually visible as colored artifacts in the image.
Photographing with a higher ISO or less-sophisticated digital camera
can result in images with objectionable noise.
Luminance
Smoothing reduces grayscale noise, while Color Noise Reduction reduces
chroma noise. Moving a slider to zero turns off its noise reduction.
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Moving
the Luminance Smoothing slider to the right reduces grayscale noise,
and moving the Color Noise Reduction slider to the right reduces chroma
noise.
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