Function channel

desktop/runtime-host/theme-service.ts:89–92

(value: number)

  const rgb = hexToRgb(hex)
  if (!rgb) return 0
  const channel = (value: number) => {
    const normalized = value / 255
    return normalized <= 0.03928 ? normalized / 12.92 : ((normalized + 0.055) / 1.055) ** 2.4
  }
  return 0.2126 * channel(rgb.r) + 0.7152 * channel(rgb.g) + 0.0722 * channel(rgb.b)
}