Select0r

Select0r is a real thing from professional compositing - it's the Foundry/Nuke keying tool that grew up around pulling clean mattes from color differences. ComfyTV ships its own port of the concept as a stage, which is a flex: this is the tool to reach for when you need to key something where a green screen isn't the answer, or when the green screen is there but the standard chroma key is leaving garbage edges. It sits under ComfyTV/Keying alongside the pack's chroma key and despill suite.

The core idea: you pick a key_color (hex, default #00FF00), and the node computes a matte from distance in color space rather than a flat chroma range. The delta_1/delta_2/delta_3 sliders (0.001–2, default 0.2 each) are the tolerance along the three axes of the working space - and that space dropdown is where it gets compositor-flavored: rgb, abi, or hci. (If you know Nuke's Select0r, those are the same color-space choices, ported faithfully.) shape picks the tolerance volume - box, ellipsoid, octahedron - and edge (hard, fat, normal, skiny, slope) controls how the matte behaves at the color boundary. slope (0.001–1, default 0.2) is the falloff at the edges of your key; it's the knob that turns a hard, aliased edge into a soft, spilly key.

There's also invert (flip the matte), and output - matte (default, grayscale key output) or image (the held-out/processed image). Video goes in (optional video), video comes out (the matte or image as a video), ready to feed a despill, KeyMix, or a Compose stage for the actual composite.

When to use it

Reach for Select0r when a straight chroma key fails: uneven green-screen lighting, spill, or footage where the key color isn't actually uniform. The deltas + shape + edge combo is far more forgiving than a single tolerance slider. Don't reach for it when you're cutting out a subject from an arbitrary background - that's a job for the pack's SAM-based tools (Split Parts, cutout), not a color keyer. It's also a genuinely deep node: the defaults are conservative, so a beginner who only moves key_color will get a muddy matte. Move delta_1..3 up together first.

Install

Part of ComfyTV:

cd ComfyUI/custom_nodes
git clone https://github.com/jtydhr88/ComfyTV

Restart ComfyUI; look under ComfyTV → Keying. ComfyUI Manager: search "ComfyTV". Desktop/macOS: clone into the running instance's absolute custom_nodes path (from the startup log), fix any ComfyTV/ComfyTV/ nesting, full backend restart. No models, no extra Python deps - the key math runs through the pack's torch FX engine.

Troubleshooting

• Matte is mostly noise / everything keys. Deltas too high - the tolerance volume is eating the whole frame. Drop delta_1..3 to 0.05 and raise slowly.
• Hard, aliased edges on the composite. edge at hard with slope at the bottom is the spikiest possible key. Go normal/slope ~0.3+ for a softer boundary, then despill the residue.
• Wrong thing is keyed. Check invert - the matte is "everything close to key_color"; flip it when you want the key out.