n1ed-8.x-2.31/src/Flmngr/lib/file/blurHash/Color.php

<?php

namespace Drupal\n1ed\Flmngr\lib\file\blurHash;

final class Color {

  public static function toLinear($value) {
    $value = $value / 255;
    return ($value <= 0.04045)
      ? $value / 12.92
      : pow(($value + 0.055) / 1.055, 2.4);
  }

  public static function tosRGB($value) {
    $normalized = max(0, min(1, $value));
    $result = ($normalized <= 0.0031308)
      ? (int) round($normalized * 12.92 * 255 + 0.5)
      : (int) round((1.055 * pow($normalized, 1 / 2.4) - 0.055) * 255 + 0.5);
    return max(0, min($result, 255));
  }
}