completed exercise3.rst

docs/exercise3.rst

@@ -7,18 +7,19 @@ files and process these data using the custom ``CommandLineTask``. The built-in
 methods to stage data between fireworks and handling of command line options, flags 
 input and output as workflow data. 
 
-Problem 3.1
------------
-
-Provided is a set of reusable operations implemented using the ``convert`` and 
+Given is a set of reusable operations implemented using the ``convert`` and 
 ``montage`` commands from the *ImageMagick* package with different sets of 
-command line flags. THese are:
+command line flags. These are:
 
-    - Rotate +90 degrees
+    - Rotate +/-90°, 180°
     - Horizontal flip
     - Vertical flip
     - Montage
-    - Concatenate
+    - Swirl
+    - Animate
+
+Problem 3.1
+-----------
 
 The input files are images of different 2x2-tiled capital letters. Some of the 
 input tiles are rotated or mirrored vertically or horizontally and some missing 
@@ -35,6 +36,10 @@ workflow and check the resulting image.
 Problem 3.2
 -----------
 
-Provided an image as input, swirl the image at the angles 90°, 180°, 270° and 360°
+Given an image as input, swirl the image at the angles 90°, 180°, 270° and 360°
 producing four new images. Arrange the original and the resulting images in the 
-sequence: 0°->90°->180°->270°->360°->270°->180°->90°->0°, and make an animation.
+sequence: 
+
+0° → 90° → 180° → 270° → 360° → 270° → 180° → 90° → 0°
+
+and make an animation.