edge detection

[imago.git] / imago.py

diff --git a/imago.py b/imago.py
index 1d364a5..94f90a0 100755 (executable)
--- a/imago.py
+++ b/imago.py
@@ -4,19 +4,36 @@
 import Image
 import im_debug
 import sys
+from filter import filter
+
+class Usage(Exception):
+    def __init__(self, msg):
+        self.msg = msg
 
 def main(argv=None):
     """Main function of the program."""
-    if argv is None:
-        argv = sys.argv[1]
+    try:
+        if argv is None:
+            try:
+                argv = sys.argv[1]
+            except IndexError:
+                raise Usage('no arguments given')
+    except Usage, err:
+        print >>sys.stderr, err.msg
+        print >>sys.stderr, "for help use --help"
+        return 2
 
     #TODO exception on empty argument
     #TODO exception on file error
     image = Image.open(argv)
-    im_debug.show(image, "Original image")
+    im_debug.show(image, "original image")
 
     im_l = image.convert('L')
     im_debug.show(im_l, "ITU-R 601-2 luma transform")
 
+    im_edges = filter(im_l)
+    im_debug.show(im_edges, "edge detection")
+
 if __name__ == '__main__':
-    main()
+    main() #sys.exit(main())
+