Drag the opacity slider to see how a LUT blends with the original image across the full tonal range. Compare the shift at each opacity level across common colour channels.
In most software, opacity and strength refer to the same mathematical operation: a linear blend between the original pixel value and the LUT output. DaVinci Resolve calls it "opacity" in the LUT node settings; Premiere Pro calls it "intensity" in Lumetri Colour; Final Cut Pro calls it "Mix" in the Custom LUT effect. The calculation is identical.
DaVinci Resolve
Colour page → add a LUT node → right-click the node → Colour Space Transform → LUT Opacity slider at the top
Premiere Pro
Lumetri Colour panel → Creative tab → Look → drag the Intensity slider below the LUT name
Final Cut Pro
Effects panel → Colour → Custom LUT → adjust the Mix slider in the inspector
CapCut
Effects → LUT → tap the applied LUT to reveal the opacity/intensity slider
Any time a LUT feels heavy, artificial, or is pushing colours in a direction you don't want, try reducing opacity before reaching for other corrections. This is especially true for LUTs built from a different camera or exposure than your footage. Reducing to 70–80% often gets you the "flavour" of the grade without the heavy-handedness.
Control LUT strength with a live slider on your own images in Luttie.
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