def assert_aux_channel_preserved(self, mode, transform_in_place,
preserved_channel):
def create_test_image():
# set up test image with something interesting in the tested aux
# channel.
nine_grid_deltas = [
(-1, -1),
(-1, 0),
(-1, 1),
(0, -1),
(0, 0),
(0, 1),
(1, -1),
(1, 0),
(1, 1),
]
chans = []
bands = ImageMode.getmode(mode).bands
for band_ndx in range(len(bands)):
channel_type = 'L' # 8-bit unorm
channel_pattern = hopper(channel_type)
# paste pattern with varying offsets to avoid correlation
# potentially hiding some bugs (like channels getting mixed).
paste_offset = (int(band_ndx / float(len(bands)) *
channel_pattern.size[0]),
int(band_ndx / float(len(bands) * 2) *
channel_pattern.size[1]))
channel_data = Image.new(channel_type, channel_pattern.size)
for delta in nine_grid_deltas:
channel_data.paste(
channel_pattern,
tuple(paste_offset[c] +
delta[c] * channel_pattern.size[c]
for c in range(2)))
chans.append(channel_data)
return Image.merge(mode, chans)
source_image = create_test_image()
source_image_aux = source_image.getchannel(preserved_channel)
# create some transform, it doesn't matter which one
source_profile = ImageCms.createProfile("sRGB")
destination_profile = ImageCms.createProfile("sRGB")
t = ImageCms.buildTransform(source_profile,
destination_profile,
inMode=mode,
outMode=mode)
# apply transform
if transform_in_place:
ImageCms.applyTransform(source_image, t, inPlace=True)
result_image = source_image
else:
result_image = ImageCms.applyTransform(source_image,
t,
inPlace=False)
result_image_aux = result_image.getchannel(preserved_channel)
self.assert_image_equal(source_image_aux, result_image_aux)
def test_auxiliary_channels_isolated(self):
# test data in aux channels does not affect non-aux channels
aux_channel_formats = [
# format, profile, color-only format, source test image
('RGBA', 'sRGB', 'RGB', hopper('RGBA')),
('RGBX', 'sRGB', 'RGB', hopper('RGBX')),
('LAB', 'LAB', 'LAB', Image.open('Tests/images/hopper.Lab.tif')),
]
for src_format in aux_channel_formats:
for dst_format in aux_channel_formats:
for transform_in_place in [True, False]:
# inplace only if format doesn't change
if transform_in_place and src_format[0] != dst_format[0]:
continue
# convert with and without AUX data, test colors are equal
source_profile = ImageCms.createProfile(src_format[1])
destination_profile = ImageCms.createProfile(dst_format[1])
source_image = src_format[3]
test_transform = ImageCms.buildTransform(
source_profile,
destination_profile,
inMode=src_format[0],
outMode=dst_format[0])
# test conversion from aux-ful source
if transform_in_place:
test_image = source_image.copy()
ImageCms.applyTransform(test_image,
test_transform,
inPlace=True)
else:
test_image = ImageCms.applyTransform(source_image,
test_transform,
inPlace=False)
# reference conversion from aux-less source
reference_transform = ImageCms.buildTransform(
source_profile,
destination_profile,
inMode=src_format[2],
outMode=dst_format[2])
reference_image = ImageCms.applyTransform(
source_image.convert(src_format[2]),
reference_transform)
self.assert_image_equal(test_image.convert(dst_format[2]),
reference_image)
def test_lab_roundtrip(self):
# check to see if we're at least internally consistent.
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(psRGB, pLab, "RGB", "LAB")
t2 = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assertEqual(i.info['icc_profile'],
ImageCmsProfile(pLab).tobytes())
out = ImageCms.applyTransform(i, t2)
self.assert_image_similar(hopper(), out, 2)
def test_sanity(self):
# basic smoke test.
# this mostly follows the cms_test outline.
v = ImageCms.versions() # should return four strings
self.assertEqual(v[0], '1.0.0 pil')
self.assertEqual(list(map(type, v)), [str, str, str, str])
# internal version number
self.assertRegex(ImageCms.core.littlecms_version, r"\d+\.\d+$")
self.skip_missing()
i = ImageCms.profileToProfile(hopper(), SRGB, SRGB)
self.assert_image(i, "RGB", (128, 128))
i = hopper()
ImageCms.profileToProfile(i, SRGB, SRGB, inPlace=True)
self.assert_image(i, "RGB", (128, 128))
t = ImageCms.buildTransform(SRGB, SRGB, "RGB", "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "RGB", (128, 128))
i = hopper()
t = ImageCms.buildTransform(SRGB, SRGB, "RGB", "RGB")
ImageCms.applyTransform(hopper(), t, inPlace=True)
self.assert_image(i, "RGB", (128, 128))
p = ImageCms.createProfile("sRGB")
o = ImageCms.getOpenProfile(SRGB)
t = ImageCms.buildTransformFromOpenProfiles(p, o, "RGB", "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "RGB", (128, 128))
t = ImageCms.buildProofTransform(SRGB, SRGB, SRGB, "RGB", "RGB")
self.assertEqual(t.inputMode, "RGB")
self.assertEqual(t.outputMode, "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "RGB", (128, 128))
# test PointTransform convenience API
hopper().point(t)
def test_lab_srgb(self):
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
img = Image.open('Tests/images/hopper.Lab.tif')
img_srgb = ImageCms.applyTransform(img, t)
# img_srgb.save('temp.srgb.tif') # visually verified vs ps.
self.assert_image_similar(hopper(), img_srgb, 30)
self.assertTrue(img_srgb.info['icc_profile'])
profile = ImageCmsProfile(BytesIO(img_srgb.info['icc_profile']))
self.assertIn('sRGB', ImageCms.getProfileDescription(profile))
def test_lab_color(self):
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(psRGB, pLab, "RGB", "LAB")
# Need to add a type mapping for some PIL2 type to TYPE_Lab_8 in
# findLCMSType, and have that mapping work back to a PIL2 mode
# (likely RGB).
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "LAB", (128, 128))
# i.save('temp.lab.tif') # visually verified vs PS.
target = Image.open('Tests/images/hopper.Lab.tif')
self.assert_image_similar(i, target, 3.5)
def test_simple_lab(self):
i = Image.new('RGB', (10, 10), (128, 128, 128))
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(psRGB, pLab, "RGB", "LAB")
i_lab = ImageCms.applyTransform(i, t)
self.assertEqual(i_lab.mode, 'LAB')
k = i_lab.getpixel((0, 0))
# not a linear luminance map. so L != 128:
self.assertEqual(k, (137, 128, 128))
l_data = i_lab.getdata(0)
a_data = i_lab.getdata(1)
b_data = i_lab.getdata(2)
self.assertEqual(list(l_data), [137] * 100)
self.assertEqual(list(a_data), [128] * 100)
self.assertEqual(list(b_data), [128] * 100)