PHP 实现的将图片转换为TXT，

PHP 实现的将图片转换为TXT，

PHP 实现的将图片转换为TXT

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function getimgchars($color_tran,$chars){
  $length = strlen($chars);
  $alpha=$color_tran['alpha'];
  $r=$color_tran['red'];
  $g=$color_tran['green'];
  $b=$color_tran['blue'];
  $gray = intval(0.2126 * $r + 0.7152 * $g + 0.0722 * $b);

  if($gray==0){
    return '.';
  }

  if($gray'.$char."