def test_tiff_depths(self):
"""
Tests the conversions between all supported dtypes in tiff.
"""
tif_file = tempfile.NamedTemporaryFile(suffix='.tif',
prefix="ipol_",
delete=True)
for src_depth in ('8i', '16i', '32i', '16f', '32f'):
for dst_depth in (
'8i', '16i',
'32i'): # float as a destination is not strictly equal
data = self.data_matrix(src_depth)
im = Image(data=data)
im.convert_depth(dst_depth)
im.write(tif_file.name)
im = Image(src=tif_file.name)
data = self.data_matrix(dst_depth)
self.assertTrue(
im.data.dtype is data.dtype,
msg="dtype expected={} found={}, conversion failed {} > {}"
.format(data.dtype, im.data.dtype, src_depth, dst_depth))
self.assertTrue(
(im.data == data).all(),
msg="data alteration during conversion {} > {}.".format(
src_depth, dst_depth))
tif_file.close()
def convert_tiff_to_png(self, img):
"""
Converts the input TIFF to PNG.
This is used by the web interface for visualization purposes
"""
data = {"status": "KO"}
try:
buf = base64.b64decode(img)
# cv2.IMREAD_ANYCOLOR option try to convert to uint8, 7x faster than matrix conversion
# but fails with some tiff formats (float)
im = Image(buf=buf)
im.convert_depth('8i')
buf = im.encode('.png')
data["img"] = binascii.b2a_base64(buf).decode() # re-encode bytes
data["status"] = "OK"
except Exception:
message = "TIFF to PNG for client, conversion failure."
self.logger.exception(message)
return json.dumps(data, indent=4).encode()