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Do not try and save signed integer output, improved signed checks for tif.

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This commit is contained in:
Steven Silvester
2014-10-08 22:42:51 -05:00
parent 047650ce38
commit bae672f34b
2 changed files with 18 additions and 10 deletions
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skimage/_shared/testing.py
+14 -4
View File
@@ -119,8 +119,13 @@ def ubyte_check(plugin, fmt='png'):
testing.assert_allclose(r3, img)
img4 = img_as_int(img)
r4 = roundtrip(img4, plugin, fmt)
testing.assert_allclose(r4, img)
if fmt.lower() in (('tif', 'tiff')):
img4 -= 100
r4 = roundtrip(img4, plugin, fmt)
testing.assert_allclose(r4, img4)
else:
r4 = roundtrip(img4, plugin, fmt)
testing.assert_allclose(r4, img_as_ubyte(img4))
img5 = img_as_uint(img)
r5 = roundtrip(img5, plugin, fmt)
@@ -150,8 +155,13 @@ def full_range_check(plugin, fmt='png'):
testing.assert_allclose(r3, img_as_uint(img))
img4 = img_as_int(img)
r4 = roundtrip(img4, plugin, fmt)
testing.assert_allclose(r4, img4)
if fmt.lower() in (('tif', 'tiff')):
img4 -= 100
r4 = roundtrip(img4, plugin, fmt)
testing.assert_allclose(r4, img4)
else:
r4 = roundtrip(img4, plugin, fmt)
testing.assert_allclose(r4, img_as_uint(img4))
img5 = img_as_uint(img)
r5 = roundtrip(img5, plugin, fmt)
skimage/io/_plugins/pil_plugin.py
+4 -6
View File
@@ -75,6 +75,8 @@ def pil_to_ndarray(im, dtype=None):
elif im.mode.startswith('I;16'):
shape = im.size
dtype = '>u2' if im.mode.endswith('B') else '<u2'
if 'S' in im.mode:
dtype = dtype.replace('u', 'i')
im = np.fromstring(im.tostring(), dtype)
im.shape = shape[::-1]
elif 'A' in im.mode:
@@ -133,10 +135,7 @@ def ndarray_to_pil(arr, format_str=None):
mode = mode_base = 'L'
else:
if arr.dtype.kind == 'u':
arr = img_as_uint(arr)
else:
arr = img_as_int(arr)
arr = img_as_uint(arr)
else:
arr = img_as_ubyte(arr)
@@ -183,8 +182,7 @@ def imsave(fname, arr, format_str=None):
All images besides single channel PNGs are converted using `img_as_uint8`.
Single Channel PNGS have the following behavior:
- Integer values in [0, 255] and Boolean types -> img_as_uint8
- Other unsigned integers and floating point -> img_as_uint16
- Other signed integers -> img_as_int16
- Floating point and other integers -> img_as_uint16
References
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