def test_gamma_corrections ():
# test individual component gamma
for i in xrange (0, 100):
x = 10.0 * (2.0 * random.random() - 1.0)
a = colormodels.linear_from_display_component (x)
b = colormodels.display_from_linear_component (a)
c = colormodels.linear_from_display_component (b)
# check
err1 = math.fabs (b - x)
rel1 = math.fabs (err1 / (b + x))
err2 = math.fabs (c - a)
rel2 = math.fabs (err2 / (c + a))
#print 'x = %g, b = %g, err = %g, rel = %g' % (x, b, err1, rel1)
#print 'a = %g, c = %g, err = %g, rel = %g' % (a, c, err2, rel2)
tolerance = 1.0e-14
if rel1 > tolerance:
raise ValueError
if rel2 > tolerance:
raise ValueError
def test_gamma_corrections():
# test individual component gamma
for i in xrange(0, 100):
x = 10.0 * (2.0 * random.random() - 1.0)
a = colormodels.linear_from_display_component(x)
b = colormodels.display_from_linear_component(a)
c = colormodels.linear_from_display_component(b)
# check
err1 = math.fabs(b - x)
rel1 = math.fabs(err1 / (b + x))
err2 = math.fabs(c - a)
rel2 = math.fabs(err2 / (c + a))
#print 'x = %g, b = %g, err = %g, rel = %g' % (x, b, err1, rel1)
#print 'a = %g, c = %g, err = %g, rel = %g' % (a, c, err2, rel2)
tolerance = 1.0e-14
if rel1 > tolerance:
raise ValueError
if rel2 > tolerance:
raise ValueError
def check_gamma_correction(self, verbose):
''' Check if the current gamma correction is consistent. '''
for i in range (10):
x = 10.0 * (2.0 * random.random() - 1.0)
a = colormodels.linear_from_display_component (x)
y = colormodels.display_from_linear_component (a)
b = colormodels.linear_from_display_component (y)
# Check errors.
abs_err1 = math.fabs (y - x)
rel_err1 = math.fabs (abs_err1 / (y + x))
abs_err2 = math.fabs (b - a)
rel_err2 = math.fabs (abs_err2 / (b + a))
msg1 = 'x = %g, y = %g, err = %g, rel = %g' % (x, y, abs_err1, rel_err1)
msg2 = 'a = %g, b = %g, err = %g, rel = %g' % (a, b, abs_err2, rel_err2)
if verbose:
print (msg1)
print (msg2)
tolerance = 1.0e-14
self.assertLessEqual(rel_err1, tolerance)
self.assertLessEqual(rel_err2, tolerance)
def check_gamma_correction(self, verbose):
''' Check if the current gamma correction is consistent. '''
for i in range(10):
x = 10.0 * (2.0 * random.random() - 1.0)
a = colormodels.linear_from_display_component(x)
y = colormodels.display_from_linear_component(a)
b = colormodels.linear_from_display_component(y)
# Check errors.
abs_err1 = math.fabs(y - x)
rel_err1 = math.fabs(abs_err1 / (y + x))
abs_err2 = math.fabs(b - a)
rel_err2 = math.fabs(abs_err2 / (b + a))
msg1 = 'x = %g, y = %g, err = %g, rel = %g' % (x, y, abs_err1,
rel_err1)
msg2 = 'a = %g, b = %g, err = %g, rel = %g' % (a, b, abs_err2,
rel_err2)
if verbose:
print(msg1)
print(msg2)
tolerance = 1.0e-14
self.assertLessEqual(rel_err1, tolerance)
self.assertLessEqual(rel_err2, tolerance)
