How to extract an image from a page?

Question

PHP

Link to the picture with the question "Note" http://site.ru/captcha_question/629
The function copy();copies and creates an empty text.
file_​get_​contents ----- file_​put_​contentsthe same.
Curl with headers, cookies and everything else opens that picture as if on a PC you open it as a text file:

PNG  IHDR9jgAMAasRGB cHRMz&u0`:pQ<bKGD	X pHYsHHFk>'WIDATxڵ]y\TDz@My █QFԨƨQ\/qKD# -Gb5nQQ+ ...

Tell me which direction to go. Nothing works.
If you open this page through Curl as in the screenshot, all pictures are displayed. Can you recognize her here?
If you write this after Curl:

echo "<img src='http://site.ru/captcha_question/629' />";

The picture is displayed correctly

Answer 1

$img = file_get_contents('http://site.ru/nota.jpg');
file_put_contents('/var/www/site.domain/images/nota.jpg', $img);
echo '<img src="/images/nota.jpg" />';

Answer 2

Solution found.
I found this line with a sniffer: Content-Transfer-Encoding: binary
Then I did this: Encoded and decoded in base64

...
$t1 = curl($cookie, $url_game.'/captcha_question/629', $url_game) or die('Ошибка: 2');

$tr = base64_encode($t1);

$tr = base64_decode($tr);
file_put_contents('img.png', $tr);

The result is a working desired picture)