Adobe Photoshop CC 2014 v.14.xx - Manual (Page 530)

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Strength
Preserve Details
Reduce Color Noise
Sharpen Details
Remove JPEG Artifacts
Controls the amount of luminance noise reduction applied to all image channels.
Preserves edges and image details such as hair or texture objects. A value of 100 preserves the most image detail, but
reduces luminance noise the least. Balance the Strength and Preserve Details controls to fine-tune noise reduction.
Removes random color pixels. A higher value reduces more color noise.
Sharpens the image. Removing noise reduces image sharpness. Use the sharpening control in the dialog box or use one
of the other Photoshop sharpening filters later to restore sharpness.
Removes blocky image artifacts and halos caused by saving a image using a low JPEG quality setting.
4. If luminance noise is more prevalent in one or two color channels, click the Advanced button and then choose the color channel from the
Channel menu. Use the Strength and Preserve Details controls to reduce noise in that channel.
More Help Topics
Correct lens distortion and noise in Camera Raw
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