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Posterize

Posterize · screenshot coming soon

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What this node does

Posterize quantizes each frame down to a limited number of colors using ffmpeg’s elbg (enhanced LBG vector quantization). Instead of smooth gradients you get bands of flat color, like a silkscreen poster or a comic. A tight palette gives a bold graphic look; a larger one keeps more detail. This is a rendered stage — it needs a ▶ Run and uses the ffmpeg elbg filter. In goes COMFYTV_VIDEO, out comes COMFYTV_VIDEO. To hand the result to a native ComfyUI node, insert a Bridge. See bridges.md.

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When to use it

  • Poster / screen-print / pop-art styling.
  • Flatten a render into a cel-shaded, cartoon-like look.
  • Reduce a busy clip to a few graphic colors.

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Parameters

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elbg_colors

1–50, default 9. Size of the color palette (codebook length) — the number of distinct colors the frame is reduced to. Fewer colors = bolder, flatter posterization; more colors = subtler, closer to the original.

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elbg_steps

1–10, default 1. Number of optimization iterations the quantizer runs to fit the palette. Higher values refine the color choices (cleaner banding) at the cost of more compute.

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Outputs

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Tips

  • Start with elbg_colors around 6–12; drop to 3–5 for a bold graphic poster.
  • Raise elbg_steps if the reduced colors look noisy or unstable between frames.
  • Pseudocolor — remap brightness to a palette (false color).
  • Video Stylize — other one-click stylized looks (edge, monochrome…).