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Histogram Equalize

Histogram Equalize · screenshot coming soon

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What this node does

Histogram Equalize spreads a clip’s tonal values more evenly across the range, pulling detail out of flat, low-contrast, or hazy footage. Classic histogram equalization can look harsh, so this node adds a strength blend (mix between original and fully equalized) and a clip_limit that caps how much any single tone can be stretched — the idea behind CLAHE — to keep noise and skies from blowing out. It takes COMFYTV_VIDEO in and out and renders on a torch backend (histeq), so it has a ▶ Run with a live preview on the card. With strength at 0 the clip passes through unchanged. To interoperate with native ComfyUI nodes, add a Bridge (see the Bridge guide).

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When to use it

  • Rescue flat, low-contrast, or foggy shots
  • Bring out shadow/highlight detail before further grading
  • Boost local contrast in a controlled way (with clip_limit)

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Parameters

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strength

How far to push equalization, default 0.5, range 0.0…1.0. It’s a blend: 0.0 is the untouched clip (the node becomes a pass-through), 1.0 is full equalization. Start around 0.4–0.6 and back off if it looks harsh.

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clip_limit

Caps the fraction any single histogram bin can hold, default 0.0, range 0.0…0.1 (step 0.005). 0 means off (plain equalization). Small positive values (this is the CLAHE-style contrast limit) prevent over-amplifying noise in flat regions like skies. Raise it gently if equalization is amplifying grain.

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Outputs

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Tips

  • At strength 0 the node does nothing — turn it up to see any effect.
  • If equalizing makes noise or banding worse, add a little clip_limit rather than lowering strength all the way.
  • This maximizes contrast rather than matching a look — follow it with Video Color or a Video LUT for the final grade.
  • Auto White Balance — the other one-knob automatic corrector (neutral color)
  • Video Color — manual exposure, levels, and grading
  • Video Curves — hand-shaped contrast when you want precise control