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Glow

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Filter

Adds a bloom/glow effect by brightening areas above a luminance threshold.

Glow extracts bright areas of the image (above the threshold), blurs them, and blends them back. This creates a soft bloom around highlights, the same effect used in film and game rendering.

The tint color lets you shift the glow toward a specific hue. Multiple quality levels control how many blur passes are used, trading speed for smoothness.

Parameters

Section titled “Parameters”

Pins

ImageImage
InputRequired
MaskMask
InputOptional
ImageImage
Output

Filter

ThresholdNumber
Default: 0.40 Range: 0.00–1.00

Only pixels brighter than this contribute to the glow. 0 = all pixels glow, 1 = nothing glows.

RadiusNumber · px/%
Default: 10.0 Range: 1.0–300.0 px / 0–100%

Glow spread radius. Larger values produce a wider, softer glow

IntensityNumber
Default: 1.00 Range: 0.00–5.00

Glow brightness multiplier. 0 = no glow, higher = brighter.

Color

TintColor (RGB)
Default: rgb(255, 255, 255)

Glow tint (red component)

Blend

Blend ModeChoice
Default: Add

How glow is composited onto the original

  • AddAdds the glow directly, which can clip to white in very bright areas.
  • ScreenScreen blend that brightens without clipping. Most natural-looking glow.
  • Soft LightSubtle, gentle glow that enhances brightness without a strong bloom effect.
QualityChoice
Default: Medium (3 passes)

Number of blur passes for smoother glow. More passes = smoother but slower

  • Fast (1 pass)One blur pass. Fastest, but may show slight banding in the glow.
  • Medium (3 passes)Three blur passes, giving a smooth glow with good performance.
  • High (6 passes)Six blur passes, giving the smoothest possible glow, best for final output.

Mask

Mask FromChoice
Default: Luminance
Color image connected to the mask input

How the connected color image is read as a mask. Luminance: the image's brightness. Alpha: the image's transparency. Red / Green / Blue: a single channel

  • LuminanceRead the image's brightness as the mask. The default.
  • AlphaRead the image's transparency as the mask.
  • RedUse the red channel as the mask.
  • GreenUse the green channel as the mask.
  • BlueUse the blue channel as the 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, with 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”
  • Lower the threshold to make more of the image glow; raise it to restrict glow to only the brightest highlights.
  • Use a colored tint for stylized effects: warm for golden hour, cool for sci-fi.
  • Switch to Screen blend mode to prevent clipping in bright areas; the default (Add) can blow out highlights.
  • Connect a mask input to restrict which pixels are glow source candidates. The bloom still spreads naturally beyond the masked area.
Section titled “Related Nodes”