Which parameter specifically targets smoothing of luminance noise in grayscale regions?

• A. Luminance Smoothing
• B. Color Noise Reduction
• C. Exposure
• D. Tone Curve

Answer: (A)

Luminance smoothing targets the brightness grain in an image, which is the noise you see as small, random variations in gray tones, especially in grayscale regions. It smooths these brightness fluctuations by combining nearby pixel luminance values, reducing the perceived grain while keeping color information intact. This is the specific adjustment you’d use when you want to clean up a gray area without broad color changes or shifting overall exposure.

Color noise reduction, in contrast, tackles color speckles—random color variations—rather than brightness grain. Exposure changes the overall light level of the image and doesn’t specifically reduce noise. Tone curve adjusts how brightness and contrast are mapped across tones, again not aimed at smoothing noise.

So, the setting that directly targets smoothing of luminance noise in grayscale regions is luminance smoothing.