def check_Lab_f_inverse_2(self, f0, verbose):
''' Check that Lab_f() is the inverse of Lab_f_inverse() for the given f0. '''
t0 = colormodels.Lab_f_inverse(f0)
f1 = colormodels.Lab_f(t0)
# Check error.
error = math.fabs(f1 - f0)
tolerance = 1.0e-10
self.assertLessEqual(error, tolerance)
msg = 'f0: %g t(f0): %g f(t(f0)): %g Error: %g' % (f0, t0, f1,
error)
if verbose:
print(msg)
def check_Lab_f_inverse_1(self, t0, verbose):
''' Check that Lab_f_inverse() is the inverse of Lab_f() for the given t0. '''
f0 = colormodels.Lab_f(t0)
t1 = colormodels.Lab_f_inverse(f0)
# Check error.
error = math.fabs(t1 - t0)
tolerance = 1.0e-13
self.assertLessEqual(error, tolerance)
msg = 't0: %g f(t0): %g t(f(t0)): %g Error: %g' % (t0, f0, t1,
error)
if verbose:
print(msg)
def test_B(f0, tolerance=1.0e-10, verbose=1):
'''Check that Lab_f() is the inverse of Lab_f_inverse() for the given f0.'''
# we should cover both ranges in the tests
if f0 > colormodels.LAB_F_A * colormodels.L_LUM_CUTOFF + colormodels.LAB_F_B:
range_info = 'in normal range'
else:
range_info = 'in linear range'
t0 = colormodels.Lab_f_inverse(f0)
f1 = colormodels.Lab_f(t0)
# check error
error = math.fabs(f1 - f0)
passed = (error <= tolerance)
if passed:
status = 'pass'
else:
status = 'FAILED'
msg = 'test_Lab_f.test_B() : f0 = %g (%s), t(f0) = %g, f(t(f0)) = %g, error = %g, %s' % (
f0, range_info, t0, f1, error, status)
if verbose >= 1:
print(msg)
if not passed:
pass
raise ValueError(msg)
return passed
def test_A(t0, tolerance=1.0e-13, verbose=1):
'''Check that Lab_f_inverse() is the inverse of Lab_f() for the given t0.'''
# we should cover both ranges in the tests
if (t0 > colormodels.L_LUM_CUTOFF):
range_info = 'in normal range'
else:
range_info = 'in linear range'
f0 = colormodels.Lab_f(t0)
t1 = colormodels.Lab_f_inverse(f0)
# check error
error = math.fabs(t1 - t0)
passed = (error <= tolerance)
if passed:
status = 'pass'
else:
status = 'FAILED'
msg = 'test_Lab_f.test_A() : t0 = %g (%s), f(t0) = %g, t(f(t0)) = %g, error = %g, %s' % (
t0, range_info, f0, t1, error, status)
if verbose >= 1:
print(msg)
if not passed:
pass
raise ValueError(msg)
return passed