Displaying image from php script displays string

Sorry if this has been asked a thousand time. I read through the web and think to have done everything I should.

I have a db with a bytea field. In it I stored data from a png file. When I stored it I used pg_escape_bytea(<CONTENTS OF FILE>) and it seems it ended up ok in the database.

I made a test setup, check this out:

http://qmprozesse.aemtervz.de/jdbqm/php/imagetest.html

Here the store script:
<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');

include_once 'classes/dbop.php';

$thePrefName = $_REQUEST['prefkeyname'];
//$theData = $_REQUEST['file'];

if ($_FILES["file"]["error"] > 0)
{
echo "Error: " . $_FILES["file"]["error"] . "<br />";
return;
} else {
echo "Upload: " . $_FILES["file"]["name"] . "<br />";
echo "Type: " . $_FILES["file"]["type"] . "<br />";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
echo "Stored in: " . $_FILES["file"]["tmp_name"];
}

$file=fopen($_FILES["file"]["tmp_name"],"r") or exit("Unable to open file!");
$filedata = '';
while (!feof($file))
{
$filedata .= fgetc($file);
}
fclose($file);
$filedata = pg_escape_bytea($filedata);

$query = 'INSERT INTO qmcustomerdata (prefkey,dataval) VALUES(\'' . $thePrefName . '\',\'' . $filedata . '\')';
Dbop::singleton()->querydb($query);

?>

Here the script customer_displayimage.php pointed to:
<?php

error_reporting(E_ALL);
ini_set('display_errors', '1');

include_once 'classes/dbop.php';

$query = 'SELECT dataval FROM qmcustomerdata WHERE prefkey=\'' . $_REQUEST['prefkey'] . '\'';
$result = Dbop::singleton()->querydb($query);
echo pg_unescape_bytea($result[0]['dataval']);

?>

Here the Dbop and what it's doing:

public function querydb($querystring)
{
// echo '<br>DEBUG::' . $querystring . '<br>';
$dbconnection = pg_connect("host=localhost dbname=xxxxx user=xxxxx password=xxxxx")
or die('could not connect: ' . pg_last_error());
$result = pg_query($querystring);
$ra = array();
if (pg_num_rows($result)){
$ra = pg_fetch_all($result);
}
pg_free_result($result);
pg_close($dbconnection);

return $ra;
}

What am I doing wrong?

Thanks
Alex