def test_rgb_to_lch_chain():
rgb_arr = _img()[:, 0]
xyz_arr = nphusl.rgb_to_xyz(rgb_arr)
luv_arr = nphusl.xyz_to_luv(xyz_arr)
lch_arr = nphusl.luv_to_lch(luv_arr)
lch_arr2 = nphusl.rgb_to_lch(rgb_arr)
assert np.all(lch_arr == lch_arr2)
def test_lch_to_luv():
img = _img()
lch = nphusl.rgb_to_lch(img)
luv = nphusl.lch_to_luv(lch) # we're testing this
xyz = nphusl.rgb_to_xyz(img)
luv_2 = nphusl.xyz_to_luv(xyz)
lch_2 = nphusl.luv_to_lch(luv_2)
assert _diff(lch_2, lch) # just a sanity check on RGB -> LCH
assert _diff(luv, luv_2)
def test_luv_to_lch_3d():
img = _img()
xyz_arr = nphusl.rgb_to_xyz(img)
luv_arr = nphusl.xyz_to_luv(xyz_arr)
lch_new = nphusl.luv_to_lch(luv_arr)
for row in range(lch_new.shape[0]):
for col in range(lch_new.shape[1]):
lch_old = husl.rgb_to_lch(*img[row, col])
assert _diff(lch_new[row, col], lch_old)
def test_luv_to_lch():
rgb_arr = _img()[:, 0]
rgb_arr = _img()
rgb_arr = rgb_arr.reshape((rgb_arr.size // 3, 3))
xyz_arr = nphusl.rgb_to_xyz(rgb_arr)
luv_arr = nphusl.xyz_to_luv(xyz_arr)
lch_arr = nphusl.luv_to_lch(luv_arr)
for i in range(rgb_arr.shape[0]):
xyz = husl.rgb_to_xyz(rgb_arr[i])
assert _diff(xyz, xyz_arr[i])
luv = husl.xyz_to_luv(xyz)
assert _diff(luv, luv_arr[i])
lch = husl.luv_to_lch(luv)
assert _diff(lch, lch_arr[i])