вот так?
mysql_query("SET NAMES \'cp_1251\'");
$s=mysql_query("SELECT * FROM table");
while($r=mysql_fetch_assoc($s)){
$filename="vendor_".$r[\'factory_id\'].".jpg";
$F=fopen("../vendors_images/".$filename, \'wb\');
fwrite($F,$r[\'logo_blob\']);
fclose($F);
echo $filename."
";
if(!$F) echo "false";
}