Image Upload -> Thumbnail Generator

[Anon]

I am building an object oriented form class to speed some of my development projects, but am running into difficulty when migrating over my image upload -> thumbnail generator function. I am getting the error:

"Warning: Unable to create './img/user/P1010024.JPG': Permission denied in c:\inetpub\wwwroot\vendor\obj\form.php on line 271"

Being denied permission to write the file to disk on the initial upload, before generating the thumbnail. I have checked my directory permissions and they seem correct. I feel like I am overlooking something small here which hopefully someone else can catch. A working example of the problem is available <a href="http://www.vortexstudio.com/vendor/test.php" target="_blank">here</a> though that server doesn't have the GD library. Here is the function code itself, the error is coming from this line:

"copy($imagePointer, $tempDir);"

function createJPEGThumbnail($imagePointer, $saveDir, $thumbnailWidth, $fullSizeWidth) {
	$imageURL = $this->values["image"];
	$imageName = $this->parseLast($imageURL, "\\");
	$imageExtension = $this->parseLast($imageName, ".");

	// check for filename existance
	while(file_exists("$saveDir/$imageName")) {
		$imageName = "1" . $imageName;
	}

	// copy file to local directory
	$tempDir = $saveDir . "/" . $imageName;
	print("$tempDir<br>");
	copy($imagePointer, $tempDir);

	// create an image object from the existing file 
	$imIn = ImageCreatefromJPEG($tempDir); 

	// get size of original image 
	$size = GetImageSize($tempDir); 

	// calculate size for new thumbnail canvas
	if($size[0] > $thumbnailWidth) {
		$imOutWidthThumb = $thumbnailWidth;
		$resizeFactor = $thumbnailWidth / $size[0];
		$imOutHeightThumb = $resizeFactor * $size[1]; 
	} else {
		$imOutWidthThumb = $size[0];
		$imOutHeightThumb = $size[1];
	}

	// calculate size for new fullsize canvas
	if($size[0] > $fullSizeWidth) {
		$imOutWidthFull = $fullSizeWidth; 
		$resizeFactor = $fullSizeWidth / $size[0];
		$imOutHeightFull = $resizeFactor * $size[1]; 
	} else {
		$imOutWidthFull = $size[0];
		$imOutHeightFull = $size[1];
	}

	// create the blank canvas 
	$imOutThumb = ImageCreate($imOutWidthThumb, $imOutHeightThumb); 
	$imOutFull = ImageCreate($imOutWidthFull, $imOutHeightFull);

	// copy the original image to the thumbnail
	ImageCopyResized($imOutThumb, $imIn, 0, 0, 0, 0, $imOutWidthThumb, $imOutHeightThumb, $size[0], $size[1]); 
	// copy the original image to the fullsize
	ImageCopyResized($imOutFull, $imIn, 0, 0, 0, 0, $imOutWidthFull, $imOutHeightFull, $size[0], $size[1]); 

	$thumbnail = "thumbnail_" . $imageName;
	$fullSize = "full_" . $imageName;

	// output the image and destroy it 
	ImageJPEG($imOutThumb, "$saveDir/thumbnail/$thumbnail", 100); 
	ImageJPEG($imOutFull, "$saveDir/fullsize/$fullSize", 100);
	ImageDestroy($imIn); 
	ImageDestroy($imOutThumb);
	ImageDestroy($imOutFull);
	unlink($tempDir);
}