Cinematography12 min read
Kelvin vs. Mired: Why Gels Are Rated in Mireds and What That Means When You're Matching Sources
A Full CTO gel is rated at +131 mireds, not at a Kelvin shift. That is not arbitrary. The mired scale is perceptually uniform in a way that the Kelvin scale is not -- meaning equal mired shifts look equal to the eye throughout the color temperature range. Here is the math behind gel selection and why Kelvin alone gives you the wrong gel.
KelvinMiredColor Temperature
