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Gives back tags based on RGB code if it's light or dark
public isColourDarkOrLight(rgb: number[]): 'light' | 'dark' {
// RGB to HSP equation: http://alienryderflex.com/hsp.html
const [r, g, b] = rgb;
const hsp = Math.sqrt(
0.299 * (r * r) +
0.587 * (g * g) +
0.114 * (b * b)
);
return hsp > 127.5 ? 'light' : 'dark';
}
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