readme file, help

[imago.git] / imago.py

diff --git a/imago.py b/imago.py
index 6ab51a1..d234fec 100755 (executable)
--- a/imago.py
+++ b/imago.py
@@ -1,9 +1,19 @@
 #!/usr/bin/env python
 #!/usr/bin/env python

-"""Usage: imago.py file"""
+
+"""Usage:  imago.py file
+            analyses the given file
+        imago.py file --debug
+            shows every step of the computation
+        imago.py --help
+            shows this help"""

 
 import sys
 import math
 
 import sys
 import math

-import Image, ImageDraw
+try:
+    import Image, ImageDraw
+except ImportError, msg:
+    print >>sys.stderr, msg
+    sys.exit(1)

 import im_debug
 import filter
 from hough import Hough
 import im_debug
 import filter
 from hough import Hough