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);