tmpfile() errors?

Here are the errors I am recieving: Warning: fopen("Resource id #4","wb") - Permission denied in /path/to/asciiartist.php on line 295 Warning: Supplied argument is not a valid File-Handle resource in /path/to/asciiartist.php on line 296 Warning: Supplied argument is not a valid File-Handle resource in /path/to/asciiartist.php on line 297 Warning: getimagesize: Unable to open 'Resource id #4' for reading. in /path/to/asciiartist.php on line 303 ASCIIArtist(): Cannot determine image type of shared/image02.jpg. I have checked the file permissions for the files and directory in question and they are all set to read & write, so I know this is not the problem. Here is the function that I am trying to get to work. function ASCIIArtist($image) { if ($input = @fopen($image, "rb")) { $image_data = fread ($input, 2048576); fclose($input); $tmp_image = tmpfile(); $output = fopen($tmp_image, "wb"); fwrite($output, $image_data); fclose($output); } else { exit("Cannot access ".$image." for reading. (Does not exist or has wrong permissions)"); } This code is from http://www.sebastian-r.de/. And everything works fine until it hits this function. Could I get some enlightenment on why it cannot create a temp file named $tmp_image? (ecspecially when the permissions for the file are correct?) Thanks in advance, Jas