Raphaël G. Git Repositories - cdn/blob - picture/ausweis/bnp/greyscale.php

   1 <?php
   2 $colors = [
   3         '#008053',
   4         '#008558',
   5         '#009264',
   6         '#00A76D',
   7         '#00A97A',
   8         '#00AD7D',
   9         '#00B387',
  10         '#7FCBAE',
  11 ];
  12 foreach($colors as $color) {
  13         $rgb = str_split(substr($color, 1), 2);
  14         $hex = hexdec($rgb[0]) * 0.2126 + hexdec($rgb[1]) * 0.7152 + hexdec($rgb[2]) * 0.0722;
  15         $greyscale = '#'.str_repeat(dechex($hex), 3);
  16         $hex = $hex / 255;
  17         var_dump($color.' => '.$greyscale.' => '.$hex);
  18 }