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_rgb_to_lch_3d():
rgb_arr = _img()
lch_arr = nphusl.rgb_to_lch(rgb_arr)
for row in range(lch_arr.shape[0]):
for col in range(lch_arr.shape[1]):
old_lch = husl.rgb_to_lch(*rgb_arr[row, col])
assert _diff(lch_arr[row, col], old_lch)
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_lch_to_husl_3d():
img = _img()
lch_new = nphusl.rgb_to_lch(img)
hsl_new = nphusl.lch_to_husl(lch_new)
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_old, lch_new[row, col])
hsl_old = husl.lch_to_husl(lch_old)
assert _diff(hsl_new[row, col], hsl_old)
def test_max_lh_for_chroma():
rgb_arr = _img()[:, 0]
lch_arr = nphusl.rgb_to_lch(rgb_arr)
with np.errstate(invalid="ignore"):
mx_arr = nphusl._max_lh_chroma(lch_arr)
arrays = zip(mx_arr, lch_arr, rgb_arr)
for mx, lch, rgb in arrays:
try:
mx_old = husl.max_chroma_for_LH(float(lch[0]), float(lch[2]))
except ZeroDivisionError:
# NOTE: Divide by zero is avoided in nphusl.py
# we're taking a backdoor here by using max_chroma_for_LH directly
assert np.isinf(mx)
else:
assert _diff(mx, mx_old)
def test_lch_to_husl():
rgb_arr = _img()
lch_arr = nphusl.rgb_to_lch(rgb_arr)
hsl_from_lch_arr = nphusl.lch_to_husl(lch_arr)
hsl_from_rgb_arr = nphusl.rgb_to_husl(rgb_arr)
print(rgb_arr[30:34, 0])
print(hsl_from_lch_arr[30:34, 0])
print(hsl_from_rgb_arr[30:34, 0])
for i in range(rgb_arr.shape[0]):
old_lch = husl.rgb_to_lch(*rgb_arr[i, 0])
hsl_old = husl.lch_to_husl(old_lch)
hsl_old = husl.rgb_to_husl(*rgb_arr[i, 0])
assert _diff(lch_arr[i, 0], old_lch)
assert _diff_hue(hsl_from_lch_arr[i, 0], hsl_from_rgb_arr[i, 0])
assert _diff_hue(hsl_from_lch_arr[i, 0], hsl_from_rgb_arr[i, 0])
def test_husl_to_lch():
img = _img()
lch = nphusl.rgb_to_lch(img)
husl = nphusl.rgb_to_husl(img)
lch_2 = nphusl.husl_to_lch(husl)
assert _diff(lch, lch_2)
def test_lch_to_rgb():
img = _img()
lch = nphusl.rgb_to_lch(img)
rgb = nphusl.lch_to_rgb(lch)
assert _diff(rgb, img)
def test_rgb_to_lch():
rgb_arr = _img()[:, 0]
lch_arr = nphusl.rgb_to_lch(rgb_arr)
for lch, rgb in zip(lch_arr, rgb_arr):
diff = lch - husl.rgb_to_lch(*rgb)
assert _diff(lch, husl.rgb_to_lch(*rgb))