IMG2TXT

<?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 class="brush:php;toolbar:false">";
echo $back_text;
echo "