def figures_gamma_245 ():
'''Adjust the gamma correction to a power law gamma = 2.45 and create samples.'''
colormodels.init()
colormodels.init_gamma_correction (
display_from_linear_function = colormodels.simple_gamma_invert,
linear_from_display_function = colormodels.simple_gamma_correct,
gamma = 2.45)
figures()
def figures_gamma_245 ():
'''Adjust the gamma correction to a power law gamma = 2.45 and create samples.'''
colormodels.init()
colormodels.init_gamma_correction (
display_from_linear_function = colormodels.simple_gamma_invert,
linear_from_display_function = colormodels.simple_gamma_correct,
gamma = 2.45)
figures()
def test_gamma_srgb(self, verbose=False):
''' Test default sRGB component (cannot supply exponent). '''
msg = 'Testing sRGB gamma:'
if verbose:
print (msg)
colormodels.init_gamma_correction (
display_from_linear_function = colormodels.srgb_gamma_invert,
linear_from_display_function = colormodels.srgb_gamma_correct)
self.check_gamma_correction(verbose)
def test_gamma_srgb(self, verbose=False):
''' Test default sRGB component (cannot supply exponent). '''
msg = 'Testing sRGB gamma:'
if verbose:
print(msg)
colormodels.init_gamma_correction(
display_from_linear_function=colormodels.srgb_gamma_invert,
linear_from_display_function=colormodels.srgb_gamma_correct)
self.check_gamma_correction(verbose)
def test_gamma_power(self, verbose=False):
''' Test simple power law gamma (can supply exponent). '''
gamma_set = [0.1, 0.5, 1.0, 1.1, 1.5, 2.0, 2.2, 2.5, 10.0]
for gamma in gamma_set:
msg = 'Testing power-law gamma: %g' % (gamma)
if verbose:
print (msg)
colormodels.init_gamma_correction (
display_from_linear_function = colormodels.simple_gamma_invert,
linear_from_display_function = colormodels.simple_gamma_correct,
gamma = gamma)
self.check_gamma_correction(verbose)
def test_gamma_power(self, verbose=False):
''' Test simple power law gamma (can supply exponent). '''
gamma_set = [0.1, 0.5, 1.0, 1.1, 1.5, 2.0, 2.2, 2.5, 10.0]
for gamma in gamma_set:
msg = 'Testing power-law gamma: %g' % (gamma)
if verbose:
print(msg)
colormodels.init_gamma_correction(
display_from_linear_function=colormodels.simple_gamma_invert,
linear_from_display_function=colormodels.simple_gamma_correct,
gamma=gamma)
self.check_gamma_correction(verbose)
def test_gamma(verbose=1):
if verbose >= 1:
print('Testing gamma corrections...')
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
# test default sRGB component (cannot supply exponent)
if verbose >= 1:
print('testing sRGB gamma')
colormodels.init_gamma_correction(
display_from_linear_function=colormodels.srgb_gamma_invert,
linear_from_display_function=colormodels.srgb_gamma_correct)
test_gamma_corrections()
# test simple power law gamma (can supply exponent)
gamma_set = [0.1, 0.5, 1.0, 1.1, 1.5, 2.0, 2.2, 2.5, 10.0]
for gamma in gamma_set:
if verbose >= 1:
print('testing gamma', gamma)
colormodels.init_gamma_correction(
display_from_linear_function=colormodels.simple_gamma_invert,
linear_from_display_function=colormodels.simple_gamma_correct,
gamma=gamma)
test_gamma_corrections()
print('Passed test_gamma()')
def test_gamma (verbose=1):
if verbose >= 1:
print 'Testing gamma corrections...'
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
# test default sRGB component (cannot supply exponent)
if verbose >= 1:
print 'testing sRGB gamma'
colormodels.init_gamma_correction (
display_from_linear_function = colormodels.srgb_gamma_invert,
linear_from_display_function = colormodels.srgb_gamma_correct)
test_gamma_corrections()
# test simple power law gamma (can supply exponent)
gamma_set = [0.1, 0.5, 1.0, 1.1, 1.5, 2.0, 2.2, 2.5, 10.0]
for gamma in gamma_set:
if verbose >= 1:
print 'testing gamma', gamma
colormodels.init_gamma_correction (
display_from_linear_function = colormodels.simple_gamma_invert,
linear_from_display_function = colormodels.simple_gamma_correct,
gamma = gamma)
test_gamma_corrections()
print 'Passed test_gamma()'
