showstack / glossary / subtractive-mixing
Subtractive colour mixing 減色混合
Mixing by removing light. One white source passes through layers that each remove part of the spectrum, and removal multiplies rather than adds, so you start at white and take away. This is what gel does, what a CMY fixture's dichroic flags do, and what a costume does to the light falling on it.
中文
以扣除光線來混色。單一白光穿過若干層，每層扣掉一部分光譜；扣除是相乘而非相加，因此起點是白，逐層減去。色紙、CMY 燈具的二向色濾片，以及打在服裝上的光，都是這樣運作。
Regional usage
| Where | Term | Note |
|---|---|---|
| UK / US | Subtractive mixing | |
| HK / TW | 減色混合 / 減法混色 |
Easy to get wrong
On a subtractive fixture, saturation costs output; on an additive one it does not. Two units set to the same picker value will not match, having taken different spectral routes.
Next to this
Additive colour mixing加色混合Mixing by adding light. Each emitter contributes its own spectrum and the surface receives the sum, so you st…Gel色紙A sheet of coloured polyester or polycarbonate placed in front of a lamp to colour the beam. Modern gel is no…Dichroic filter二向色濾片A filter that reflects the wavelengths it does not pass, rather than absorbing them. Made from thin interfere…
Sources
- CIE colorimetry and colour mixing fundamentals — International Commission on Illumination primary
Understand the mechanism
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