def assertvalidimage(self, filename):
if not os.path.isfile(filename):
raise IOError(filename + " does not exist.")
if "OpenEXR" in self.backends:
if not exr.isOpenExrFile(filename):
raise IOError(filename + " cannot be opened using OpenEXR.")
elif "VTK" in self.backends:
reader = self._make_reader(filename)
if not reader.CanReadFile(filename):
raise IOError("VTK Cannot open file " + filename)
elif "PIL" in self.backends:
try:
PIL.Image.open(filename)
except IOError:
raise
else:
raise RuntimeError(
"Warning: need OpenEXR or PIL or VTK to validate file store")
