def get_illuminant_xyz(self, observer=None, illuminant=None):
"""
:param str observer: Get the XYZ values for another observer angle. Must
be either '2' or '10'.
:param str illuminant: Get the XYZ values for another illuminant.
:returns: the color's illuminant's XYZ values.
"""
try:
if observer is None:
observer = self.observer
illums_observer = color_constants.ILLUMINANTS[observer]
except KeyError:
raise InvalidObserverError(self)
try:
if illuminant is None:
illuminant = self.illuminant
illum_xyz = illums_observer[illuminant]
except (KeyError, AttributeError):
raise InvalidIlluminantError(illuminant)
return {'X': illum_xyz[0], 'Y': illum_xyz[1], 'Z': illum_xyz[2]}
def set_observer(self, observer):
"""
Validates and sets the color's observer angle.
.. note:: This only changes the observer angle value. It does no conversion
of the color's coordinates.
:param str observer: One of '2' or '10'.
"""
observer = str(observer)
if observer not in color_constants.OBSERVERS:
raise InvalidObserverError(self)
self.observer = observer