PHP 實現的將圖片轉換為TXT

/*

2015年10月19日10:24:59

*/

// 打開一幅圖像

$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 ''.$char."";;

}

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.="
";

}

echo "

";

echo $back_text;

echo "

";

//file_put_contents('1.txt',$back_text);

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