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2026-10-11 19:23:04 Matt Hughes: -/-| /dev/null .. operators/chroma key.md | |
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| + | ## Chroma Key |
| + | |
| + | The Chroma Key operator removes points by colour, the same way a green screen is keyed in video. Each point's colour is converted to HSV and points falling inside the key are discarded. It can be used to strip a backdrop or coloured props from a scene, or with **Invert** enabled to isolate them. |
| + | *[HSV]: Hue, Saturation, Value |
| + | |
| + | ### Operator Properties |
| + | - **Target Hue**: the centre of the key on the colour wheel, in degrees. The default of 140° targets green. |
| + | - **Hue Width**: the span of hues around the target that are keyed, in degrees. |
| + | - **Minimum Saturation**: points less saturated than this are never keyed, which protects greys and skin tones. |
| + | - **Minimum Value**: points darker than this are never keyed, which protects shadows. |
| + | - **Invert**: keep only the points inside the key and remove everything else. |
| + | - **Backend**: run the operator on the CPU or with CUDA. |
| + | |
| + | --- |
| + | |
| + | ::: buttonlink |
| + | [View operator source](https://github.com/matth-av/pointcaster/blob/qt/src/plugins/operators/chroma_key/chroma_key_operator.cc) |
| + | ::: |