Using PHP imagefilter() with images from MySql

[joshluv33]

I've got a photography website that sells prints of images to clients.  I am attempting to implement the imagefilter to produce black & white and sepia previews of the selected image when the client chooses it as an option in the drop down menu.  The problem I think I am having currently is setting the right path to the photo or possibly the placement of the code.  Here where the image shows up on the php page:

 

echo "<img src=\"watermark.php?i=" . $photo->id . "\" class=\"photos\">";

 

This is the code for watermark.php:

 

<?PHP
//INCLUDE FILES NEEDED TO GET SETTINGS AND WATERMARK
include( "database.php" );
include( "functions.php" );
$i = mysql_real_escape_string($_GET['i']);
if($_GET['i'] != "" && !is_numeric($_GET['i'])){
    header("location: error.php?error=i");
    exit;
  }
//GET PHOTO INFO
$photo_result = mysql_query("SELECT filename FROM uploaded_images where id = '$i' order by original", $db);
$photo = mysql_fetch_object($photo_result);


//ADDED FOR SECURITY
  if($photo->filename != ""){

//DECLARE THIS AS AN IMAGE
header("Content-type: image/jpeg");

$image = imagecreatefromjpeg('$photo->filename');
imagefilter($image, IMG_FILTER_GRAYSCALE);
imagejpeg($image, 'grayscale.jpeg);
imagedestroy($image);


//GET SETTINGS
$setting_result = mysql_query("SELECT show_watermark,sample_display_quality,sample_width,photo_dir FROM settings where id = '1' limit 1", $db);
$setting = mysql_fetch_object($setting_result);

//GET WATERMARK
if($setting->show_watermark == "1"){
	$water_img = "./images/watermark.png";
} else {
	$water_img = "./images/watermark_off.png";
}

//QUALITY LEVEL AND PHOTO PATH
$quality = $setting->sample_display_quality;
$stock_photo_path = "./" . $setting->photo_dir . "/";

watermark($stock_photo_path . "s_" . $photo->filename,"sample",$water_img,$quality,$setting->sample_width);

}


?>

 

 

As of right now no image will appear in the preview with this code, but when I take out the imagefilter code the original image displays fine.  I don't know if I have the proper coding for the path to the image or if I have the imagefilter function in the wrong spot.  Thanks for any advice.