Skip to content
ArcBrush ArcBrush Docs

Glow

Node icon
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”

Filter

ThresholdNumber
Default: 0.4 Range: 0.0–1.0

Brightness cutoff; only brighter pixels glow

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

Glow spread; larger=wider, softer glow

IntensityNumber
Default: 1.0 Range: 0.0–5.0

Glow brightness multiplier

Color

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

Glow tint color; white=natural

Blend

Blend ModeChoice
Default: Add

Compositing

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

Blur passes

  • FastOne blur pass — fastest, may show slight banding in the glow.
  • MediumThree blur passes — smooth glow with good performance.
  • HighSix blur passes — smoothest possible glow, best for final output.

Mask

Mask FitChoice
Default: None

Mask sizing

  • NoneCenter 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.
  • FitScale the mask to fit inside the image, preserving aspect ratio. Letterboxes where needed.
  • FillScale the mask to fill the image, preserving aspect ratio. Crops edges if aspect ratios differ.
Notes

Mask Fit only visible when mask is connected.

Pins: image (required), mask (optional). When mask is connected, the effect is blended with the original using the mask (white = full effect, black = original).

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.
  • Screen blend mode prevents clipping in bright areas.
  • 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”