PHP 实现的将图片转换为TXT

PHP 实现的将图片转换为TXT

    <?php
    /*
    2015年10月19日10:24:59

    */
    // 打开一幅图像

    $file_name='d:\ascii_dora.png';
    $chars = "$@B%8&WM;#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ";
    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<196){
         $unit = (256.0 + 1)/$length;
        return $chars[intval($gray/$unit)];
      }

      return " ";

    }

    function color_img($color_tran,$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);
      $rand=rand (0, $length-1);
      $color="rgb(".$r.",".$g.",".$b.")";
      $char=$chars[$rand];
      return '<span style="color:'.$color.'" >'.$char."</span>";;

    }

    function resize_img($file_name,$chars,$flage=true){
      //header('Content-Type: image/jpeg');
      list($width, $height,$type) = getimagesize($file_name);
      $fun='imagecreatefrom' . image_type_to_extension($type, false);
      if($type==3){
        $flage=false;
      }
      $fun($file_name);
      $new_height =100;
      $percent=$height/$new_height;
      $new_width=$width/$percent;
      $image_p = imagecreatetruecolor($new_width, $new_height);
      $image = $fun($file_name);
      imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
      if($flage){
        return $image_p;
      }else{
        return $image;
      }

    }

    $im=resize_img($file_name,$chars);

    $width=imagesx($im);
    $height=imagesy($im);

    $back_text="";

    for($i=1;$i<=$height;$i++){
      for($j=1;$j<=$width;$j++){
        $color_index = imagecolorat($im, $j-1, $i-1);
        $color_tran = imagecolorsforindex($im, $color_index);
        $back_text.=color_img($color_tran,$chars,false);
      }
      $back_text.="<br/>";
    }

    echo "<pre>";
    echo $back_text;
    echo "</pre>";
    //file_put_contents('1.txt',$back_text);