Lock R/G/B/A
Links the channel trim controls for a single global adjustment.
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Light EffectsIntermediate
LightTrim
Light-pass intensity trimming
Trims or attenuates the light contribution of an image with a compact global or per-channel control.
LightTrim
DaVinci Resolve · Fusion
Trims or attenuates the light contribution of an image with a compact global or per-channel control.
Overview
What LightTrim does
Trims or attenuates the light contribution of an image with a compact global or per-channel control.
LightTrim is a simple finishing operator for a light pass: instead of rebuilding the effect, reduce or rebalance its contribution before it is merged back into the composition.
Mental model
LightTrim is a simple finishing operator for a light pass: instead of rebuilding the effect, reduce or rebalance its contribution before it is merged back into the composition.
Common uses
Reduce an over-strong flare pass
Balance RGB channels in a generated light effect
Animate light intensity
Control a rays or glow branch before Merge
Fine-tune additive composites
Flow anatomy
Inputs & outputs
The port structure shows how this node fits into a Fusion graph.
Input
Source image for the operation.
Effect Mask
Optional mask that limits where the node affects the image.
LightTrim
Fusion node
Output
The processed result from this node.
Inspector
Important parameters
Start with these controls before reaching for more complicated workarounds.
Trim
Controls the overall light-pass contribution.
Per-channel Controls with Lock Disabled
Selects the image channel used by this operation.
Trim Animation
Allows the trim amount to be animated over time.
Settings
Provides standard node-level processing controls.
Practical setup
A reliable workflow
- 1
Place LightTrim after the generated light effect.
- 2
Start with channels locked.
- 3
Reduce Trim until the pass integrates naturally.
- 4
Unlock channels only when a color imbalance needs correction.
- 5
Animate Trim for controlled light fades.
Typical node chain
Source→
LightTrim→
Output
Examples
Where this node fits in real work
Flare balance
Reduce a lens effect before additive compositing.
LensFlareLightTrimMerge
Ray fade
Animate a light-ray branch without changing the ray construction.
LightRaysLightTrimMerge
Troubleshooting
Common mistakes
Applying LightTrim before the image is in the technical state the node expects.
Pushing LightTrim too far before checking artifacts at full resolution.
Judging LightTrim on one still frame instead of checking motion and edge behavior.
Production notes
Practical tips
Compare LightTrim with bypass regularly while tuning it.
Keep LightTrim and other technical conversions separate from creative grading when possible.
After strong LightTrim processing, check alpha, highlights and image boundaries.
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