Upload image file

I am attempting to upload image files to the server from a users browser using the following code, however, the images seem to get corrupted, they look completely different and the file sizes are generally smaller, also it sometimes says file upload unsuccessful, even when it does upload the file? Any ideas? Thank you //copy image to server if ($image != "none") { if (copy ($image, $dir.$image_name)){ echo "<p>File upload successful!</p>"; } else { echo "<p>File upload unsuccessful!</p>"; } //new name of image $new_name = "$property_id-$category_id-$sub_category_id.jpg"; //rename the file rename($dir.$image_name, $dir.$new_name); }