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Backport PR #32058 on branch v3.11.x (MNT: Fix handling of ints in hsv_to_rgb()) #32083

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Merged
QuLogic merged 1 commit into from
Jul 21, 2026
+9 −5
Merged

Backport PR #32058 on branch v3.11.x (MNT: Fix handling of ints in hsv_to_rgb()) #32083

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9 changes: 4 additions & 5 deletions lib/matplotlib/colors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3729,11 +3729,10 @@ def hsv_to_rgb(hsv):
f"shape {hsv.shape} was found.")

in_shape = hsv.shape
hsv = np.array(
hsv, copy=False,
dtype=np.promote_types(hsv.dtype, np.float32), # Don't work on ints.
ndmin=2, # In case input was 1D.
)
# ensure numerics are done at least on float32; ints are cast as well
hsv = np.asarray(hsv, dtype=np.promote_types(hsv.dtype, np.float32))
if hsv.ndim == 1:
hsv = np.expand_dims(hsv, axis=0) # ensure hsv is 2D

h = hsv[..., 0]
s = hsv[..., 1]
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5 changes: 5 additions & 0 deletions lib/matplotlib/tests/test_colors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -946,6 +946,11 @@ def test_rgb_to_hsv_int():
assert_array_equal(mcolors.rgb_to_hsv((0, 1, 0)), (1/3, 1, 1)) # green


def test_hsv_to_rgb_int():
# Test that int hsv values (still range 0-1) are processed correctly.
assert_array_equal(mcolors.hsv_to_rgb((0, 1, 1)), (1, 0, 0)) # red


def test_autoscale_masked():
# Test for #2336. Previously fully masked data would trigger a ValueError.
data = np.ma.masked_all((12, 20))
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