Handling pictures saved at MySQL DB using BLOB

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HTML

PHP

MySQL

I have a picture saved at a BLOB field.

I want to show it with PHP, but I'm getting what appears to be the ASCII code.

$resultado11 = mysql_query("SELECT * FROM Images") or die ("problema-- ".mysql_error());
    $row=mysql_fetch_object($resultado11);
    //Header( "Content-type: image/gif");
    echo $row->Image;

Maybe the problem is not using the header as I have read somewhere. The problem is if uncomment that line I have an error (I get a blank page). Also I dont know how to handle that header, because picture could .jpg or .png... (or does not make a difference) ?