Automatically rotate and mirror images based on EXIF orientation (only compatiable with "convert" option selected at the moment)

post.php

@@ -421,6 +421,81 @@ if (isset($_POST['delete'])) {
 				error($config['error']['maxsize']);
 			}
 			
+			// The following code corrects the image orientation based on EXIF.
+			// Currently only works with the 'convert' option selected but it could easily be expanded to work with the rest if you can be bothered.
+			if ($config['thumb_method'] == 'convert') {
+				if ($post['extension'] == 'jpg' || $post['extension'] == 'jpeg') {
+					$exif = exif_read_data($upload);
+					if (isset($exif['Orientation'])) {
+						switch($exif['Orientation']) {
+							case 1:
+								// Normal
+								$args = false;
+								break;
+							case 2:
+								// 888888
+								//     88
+								//   8888
+								//     88
+								//     88
+								
+								$args = '-flop';
+								break;
+							case 3:
+								
+								//     88
+								//     88
+								//   8888
+								//     88
+								// 888888
+								
+								$args = '-flip -flop';
+								break;
+							case 4:
+								// 88
+								// 88
+								// 8888
+								// 88
+								// 888888
+								
+								$args = '-flip';
+								break;
+							case 5:
+								// 8888888888
+								// 88  88
+								// 88
+								
+								$args = '-rotate 90 -flop';
+								break;
+							case 6:
+								// 88
+								// 88  88
+								// 8888888888
+								
+								$args = '-rotate 90';
+								break;
+							case 7:
+								//         88
+								//     88  88
+								// 8888888888
+								
+								$args = '-rotate "-90" -flop';
+								break;
+							case 8:
+								// 8888888888
+								//     88  88
+								//         88
+								
+								$args = '-rotate "-90"';
+								break;
+						}
+						
+						if ($args)
+							shell_exec('convert ' . escapeshellarg($upload) . ' ' . $args . ' ' . escapeshellarg($upload));
+					}
+				}
+			}
+			
 			// create image object
 			$image = new Image($upload, $post['extension']);