Watermarking on upload

[maxso]

Ok so I want to watermark the images people upload. Here is my script so far.

upload.php

<?
//print_r($_POST);

if($_POST["action"] == "Upload Image")
{
unset($imagename);

if(!isset($_FILES) && isset($HTTP_POST_FILES))
$_FILES = $HTTP_POST_FILES;

if(!isset($_FILES['image_file']))
$error["image_file"] = "An image was not found.";


$imagename = basename($_FILES['image_file']['name']);
//echo $imagename;

if(empty($imagename))
$error["imagename"] = "The name of the image was not found.";

if(empty($error))
{
$newimage = "images/" . $imagename;
//echo $newimage;
$result = @move_uploaded_file($_FILES['image_file']['tmp_name'], $newimage);
if(empty($result))
$error["result"] = "There was an error moving the uploaded file.";
}

}

include("upload_form.php");

if(is_array($error))
{
while(list($key, $val) = each($error))
{
echo $val;
echo "<br>\n";
}
}


?>

 

upload_form.php

<form method="POST" enctype="multipart/form-data" name="image_upload_form" action="<?$_SERVER["PHP_SELF"];?>">
<p><input type="file" name="image_file" size="20"></p>
<p><input type="submit" value="Upload Image" name="action"></p>
</form>

 

Where and how could I place my code so that it places a watermark upon upload.

[gevans]

Are you hoping to write your own code, or use existing code??

 

[.josh]

You need to have the watermark image and use the gd library functions to open the target image, superimpose the watermark over the image and save the result back to the image file.

[maxso]

This is an existing code from a tutorial I have used. I have been looking at watermarking gd() tutorials but it hasn't helped me very much.