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Select0r

Select0r · screenshot coming soon

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What this node does

Select0r pulls a matte by selecting a region of color around a key color inside a chosen color space. Rather than a single threshold, it defines a 3D selection volume — a box, ellipsoid, or octahedron — sized independently on each axis, with a controllable edge falloff. This makes it good for isolating a specific color range (a screen, a shirt, a sky) with a soft, shapeable boundary. Input and output are COMFYTV_VIDEO. It runs as a live fx-preview filter (emits an fx spec and passes through), so results preview without a full render.

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When to use it

  • You want to key on a color range, not just a flat screen, and need control over the region shape.
  • A simple chroma key’s spherical tolerance is too crude — you need per-axis sizing.
  • You’re isolating a color for a secondary grade or selective effect.

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Parameters

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key_color

The center color of the selection. Hex, default #00FF00.

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space

The color space the selection lives in: rgb (default), abi, or hci. Different spaces separate color and brightness differently — switch if the key is easier to isolate in one of them.

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shape

The geometry of the selection volume: box, ellipsoid (default), or octahedron. Ellipsoid gives smooth falloff; box is hard-cornered; octahedron is in between.

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edge

The edge falloff profile: hard, fat, normal (default), skiny, or slope. Controls how the matte transitions at the region boundary — from crisp to feathered.

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delta_1 / delta_2 / delta_3

The size of the selection region along each of the three axes of the chosen color space. Each ranges 0.001–2.0 (step 0.005), default 0.2. Larger deltas select a wider range of colors on that axis.

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slope

Softness of the edge transition. Range 0.001–1.0 (step 0.005), default 0.2. Higher values feather the matte boundary more.

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invert

When on, inverts the matte (select everything except the color region). Default off.

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output

matte (default) returns a grayscale matte; image returns the footage carrying the selection.

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Outputs

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Tips

  • Start with ellipsoid + normal edge, then grow delta_1/2/3 until the color is fully covered without spilling into neighbors.
  • Try abi or hci space when RGB can’t cleanly separate your target color from similar ones.
  • Turn on invert when it’s easier to describe what you want to keep than what you want to remove.
  • To interoperate with native ComfyUI nodes, insert a Bridge. See bridges.md.
  • Keyer / PIK Keyer / Chroma Key — other keyers producing mattes.
  • Matte Morphology — clean the Select0r matte.
  • Key Mix — composite through the matte.
  • Matte Monitor — inspect matte quality.