Which option in the Camera Raw dialog box reduces grayscale noise?

• A. Color Noise Reduction
• B. Clarity
• C. Sharpness
• D. Luminance Smoothing

Answer: (D)

Grayscale noise is the random brightness variation that shows up as grain in the lightness of an image, not tied to color. To reduce this, you want to smooth the lightness values across the image without dulling color too much. Luminance Smoothing in Camera Raw does exactly that by softening the brightness variations, which lowers the visible grayscale noise while keeping color largely intact.

Color Noise Reduction targets color speckles in the image, not the grayscale grain. Clarity boosts midtone contrast and can make noise stand out more, not reduce it. Sharpness increases edge detail and can also make noise more noticeable. So the control that best reduces grayscale noise is Luminance Smoothing.