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Video Curves

Video Curves · screenshot coming soon

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What this node does

Video Curves reshapes tones with editable curves, exactly like the Curves tool in a photo editor. You can bend the master (luminance) curve to add contrast or lift shadows, and adjust the red, green, and blue channels independently for color grading. It takes COMFYTV_VIDEO in and out and renders through ffmpeg’s curves filter. Because it re-encodes, it has a ▶ Run, with a live preview on the card. Control points are stored as JSON lists of [x, y] pairs (both 0…1); points are clamped, de-duplicated, and sorted before rendering, and a channel needs at least two valid points to take effect. To interoperate with native ComfyUI nodes, add a Bridge (see the Bridge guide).

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When to use it

  • Add filmic contrast with a gentle S-curve
  • Lift crushed blacks or roll off blown highlights
  • Neutralize a color cast by shaping R/G/B separately
  • Reach for a preset “look” (vintage, cross-process, negative) as a fast starting point

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Parameters

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preset

Dropdown of built-in curve looks, default none. Options: none, color_negative, cross_process, darker, increase_contrast, lighter, linear_contrast, medium_contrast, negative, strong_contrast, vintage. These map to ffmpeg’s built-in curve presets and can be combined with your own points.

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master_pts

JSON list of [x, y] control points (0…1) for the master/luminance curve, e.g. [[0,0],[0.5,0.55],[1,1]]. Shapes overall brightness and contrast across all channels.

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red_pts / green_pts / blue_pts

JSON [x, y] point lists for the red, green, and blue channels respectively. Use these to push a color cast in or out of specific tonal ranges — for example a warm-shadow / cool-highlight split.

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Outputs

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Tips

  • A channel with fewer than two valid points is ignored — a single point does nothing.
  • Points are clamped to 0…1 and duplicates on the same x collapse, so overlapping points won’t stack.
  • If you set both a preset and your own points, both are applied by the curves filter.
  • Video Color — sliders for exposure, temperature, and levels when you don’t need full curves
  • CDL Grade — slope/offset/power grade in the ASC-CDL convention
  • Video LUT — bake a finished look as a .cube lookup table