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Denoise

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Filter

Reduces image noise while preserving edges and detail using Non-Local Means denoising.

Denoise uses Non-Local Means (NLM) filtering to reduce noise. Unlike simple blurring, NLM compares patches across the image to distinguish between noise and real detail, preserving sharp edges while smoothing noisy areas.

Strength controls luminance noise removal, and Color Strength handles chroma noise separately. The template and search sizes control quality: larger values produce better results but take longer.

Parameters

Section titled “Parameters”

Pins

ImageImage
InputRequired
MaskMask
InputOptional
ImageImage
Output

Filter

StrengthNumber
Default: 10.0 Range: 1.0–30.0

Luminance denoising strength. Higher = more noise removed, but may lose fine detail

Color StrengthNumber
Default: 10.0 Range: 1.0–30.0

Color component denoising strength. Higher = reduces color noise (chroma speckles) more aggressively

Template Size (px)Integer
Default: 7 Range: 3–21

Size of the patch used for comparison. Larger = smoother result, slower. Must be odd (auto-corrected)

Search Size (px)Integer
Default: 21 Range: 7–81

Size of the area searched for similar patches. Larger = better quality, much slower. Must be odd (auto-corrected)

Mask

Mask FitChoice
Default: None (native size)
Mask connected

How the mask is sized when it doesn't match the image. None: center at native size, no scaling. Stretch: scale to exactly match image dimensions. Fit: scale to fit inside image, preserving aspect ratio. Fill: scale to fill image, cropping overflow

  • None (native size)Center the mask at its native size — no resizing. Unmasked regions are unaffected.
  • StretchStretch the mask to exactly match the image dimensions. May distort the mask shape.
  • Fit (letterbox)Scale the mask to fit inside the image, preserving aspect ratio. Letterboxes where needed.
  • Fill (crop)Scale the mask to fill the image, preserving aspect ratio. Crops edges if aspect ratios differ.

Usage Tips

Section titled “Usage Tips”
  • Start with strength 10 and adjust up for noisier images.
  • Increase search size for better quality at the cost of processing time.
  • Use Color Strength independently to target colorful noise speckles.
  • Connect a mask input to denoise only specific regions, targeting noisy areas while preserving detail elsewhere.
Section titled “Related Nodes”