/**
 * Estimates the Color Temperature (Kelvin) from an RGB input.
 *
 * @param {number[]|ArrayLike<number>|{0:number,1:number,2:number}} input input array
 * @param {number} [input_offset=0] offset into input array
 * @returns {number} Temperature in Kelvin (approx 1000 to 40000)
 *
 * @see https://www.zombieprototypes.com/?p=210
 */
export function rgb_to_kelvin(input: number[] | ArrayLike<number> | {
    0: number;
    1: number;
    2: number;
}, input_offset?: number): number;
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