Merge pull request #351 from wiredfool/numpy-tests

tests for img -> numpy.array

Tests/test_numpy.py

@@ -1,6 +1,7 @@
 from tester import *
 
 from PIL import Image
+import struct
 
 try:
     import site
@@ -65,10 +66,43 @@ def test_3d_array():
     assert_image(Image.fromarray(a[:, :, 1]), "L", (10, 10))
 
 
+def _test_img_equals_nparray(img, np):
+    assert_equal(img.size, np.shape[0:2])
+    px = img.load()
+    for x in xrange(0, img.size[0], img.size[0]/10):
+        for y in xrange(0, img.size[1],  img.size[1]/10):
+            assert_deep_equal(px[x,y], np[y,x])
+
+
 def test_16bit():
     img = Image.open('Tests/images/12bit.cropped.tif')
-    px = img.load()
     np_img = numpy.array(img)
-    assert_equal(np_img.shape, (64,64))
-    assert_equal(px[1,1],np_img[1,1])
+    _test_img_equals_nparray(img, np_img)
+    assert_equal(np_img.dtype, numpy.dtype('uint16'))
+
+def test_to_array():
+
+    def _to_array(mode, dtype):
+        img = lena(mode)            
+        np_img = numpy.array(img)
+        _test_img_equals_nparray(img, np_img)
+        assert_equal(np_img.dtype, numpy.dtype(dtype))
+
+
+    modes = [("L", 'uint8'),
+             ("I", 'int32'),
+             ("F", 'float32'),
+             ("RGB", 'uint8'),
+             ("RGBA", 'uint8'),
+             ("RGBX", 'uint8'),
+             ("CMYK", 'uint8'),
+             ("YCbCr", 'uint8'),
+             ("I;16", 'uint16'),
+             ("I;16B", '>u2'),
+             ("I;16L", 'uint16'),
+             ]
 
+
+    for mode in modes:
+        assert_no_exception(lambda: _to_array(*mode))
+

Tests/tester.py

@@ -67,6 +67,19 @@ def assert_equal(a, b, msg=None):
     else:
         failure(msg or "got %r, expected %r" % (a, b))
 
+def assert_deep_equal(a, b, msg=None):
+    try:
+        if len(a) == len(b):
+            if all([x==y for x,y in zip(a,b)]):
+                success()
+            else:
+                failure(msg or "got %s, expected %s" % (a,b))
+        else:
+            failure(msg or "got length %s, expected %s" % (len(a), len(b)))                 
+    except:
+        assert_equal(a,b,msg)
+
+
 def assert_match(v, pattern, msg=None):
     import re
     if re.match(pattern, v):